Mae’r termau hyn i’w defnyddio yng nghyd-destun Mathemategol

These terms are to be used in a Mathematical context

Gyda diolchiadau mawr i David Jones (Ystrad Mynach) ac Adam Gravell (Ysgol Gyfun Cwm Rhymni)

am eu help nhw.

With great thanks to David Jones (Ystrad Mynach) and Adam Gravell (Ysgol Gyfun Cwm Rhymni) for

their help.

TERMAU MATHEMATEG - SAFON UG/UWCH

MATHEMATICAL TERMS – AS/A LEVEL

English (To) accelerate

Cymraeg Cyflymu

Acceleration Cyflymiad

Acute (L)lem

Acute angle Ongl lem

Acute angled triangle Triongl ongl lem

(to) add Adio / Ychwanegu

Adjacent Cyfagos

Algebra Algebra

Algorithm/s Algorithm/au

Alternate angle/s Ongl/au eiledol

Amount/Number Nifer/oedd

(To) Analyse Dadansoddi

Analysis Dadansoddiad

Angle/s Ongl/au

Angle of rotation Ongl gylchdro

Anti-clockwise Gwrth-glocwedd

Approximation Brasamcan

Area/s Arwynebedd/au

Arithmetic Rhifyddeg

(To) assume/take Tybio

Assumption/s Tybiaeth/au

Asymptote/s Asymptot/au

Asymptotic Asymptotig

Average/s Cyfartaledd/au

Axis/axes Echelin/au

(To) balance Cydbwyso

Bar graph Graff bar

Base Sylfaen

Bearing/s Cyfeiriant/cyfeiriannau

Below Tan/Islaw

Beneath Tan/Islaw

Big Mawr

Bigger Mwy

Biggest Mwyaf

Binomial(s) Binomial/au

(To) bisect Dwyrannu

Breadth Lled

(To) calculate Cyfrifo

Calculus Calcwlws

Capacity Cynhwysedd / cyfaint

Centimetre/s Centimetr/au

Chart/s Siart/iau

(To) check Gwirio

Circle/s Cylch/oedd

Circumference/s Cylchedd/au

Clockwise Clocwedd

Combination/s Cyfuniad/au

Combinatorial Cyfuniadol

Coefficient/s Cyfernod/au

Comparison/s Cymhariaeth/cymariaethau

Compass Cwmpawd

Complementary angle/s Ongl/au cyflenwol

Complete Cyflawn

Complex Cymhlyg

Component/s Cydran/nau

Compound interest Adlog

Concave Ceugrwm

Condition/s Amod/au

Cone/s Côn/au

Constant/s Cysonyn/Cysonion

Continuous Di-dor

Contradiction/s Gwrthddywediad/au

(To) construct Llunio

Convex Amgrwm

Co-ordinate/s Cyfesuryn/nau

Correlation Cydberthyniad

Corresponding angle/s Ongl/au cyfatebol

(To) count Cyfrif

(To) cross Croesi

Cross-section Trawstoriad

Cube/s Ciwb/iau

Cube root Trydydd isradd

Cubic Ciwbig

Cumulative frequency Amledd cronnus

Curve/s Cromlin/iau

Cylinder/s Silindr/au

Data/information Data/ gwybodaeth

(To) decide Penderfynu

Decimal/s Degolyn/degolion

Decimal place Lle degol

Decimal point Pwynt degol

Degree/s Gradd/au

(To) demonstrate Arddangos / dangos

Density Dwysedd

Determinant/s Determinant/Determinannau

Determine Pennu

Diagonal/s Croeslin/iau

Diagram/s Diagram/au

Diameter/s Diamedr/au

Difference/s Gwahaniaeth/au

(To) differentiate Differu

Differential Deilliad

Differentiation Gwahaniaethiad

Digit/s Digid/au

Dimension/s Dimensiwn/dimensiynau

Direction/s Cyfeiriad/au

Direct proportion Cyfranedd union

(To) discover Darganfod

Discrete Arwahanol

Discriminant/s Gwahanolyn/Gwahanolion

Displacement Dadleoliad

Dispersal Gwasgariad

Disproof Gwrthbrawf

(To) disproove Gwrthbrofi

Distance/s Pellter/au

Distribution Dosbarthiad

(To) divide Rhannu

Divisible Rhanadwy

(To) double Dyblu

Dynamic Dynamig

Each(in each one) pob(ym mhob un)

East/ Eastern Dwyrain/ Dwyreiniol

Ellipse/s Elips/au

Elliptic Eliptig

Enlargement/s Helaethiad/au

Equal Hafal

Equals Yw/ ydy neu yn hafal i

(To) equate Hafalu

Equation/s Hafaliad/au

Equidistant Cytbell neu yr un pellter

Equilateral Hafalochrog

Equilateral triangle Triongl hafalochrog

Equilibrium Ecwilibriwm

Error/s Cyfeiliornad/au

(To) estimate Amcangyfrif

(To) evaluate Enrhifo

Even number/s Eilrif/au

Exhaustion Dihysbyddiad

Exponent/s Esbonydd/ion

Exponential Esbonyddol

Expression Mynegiad

External Allanol

Face/s Wyneb/au

Fact/s Ffaith/ffeithiau

Factor/s Ffactor/au

Factorial Ffactorial

(To) factorise Ffactorio

FALSE Anwir

Figure/s Ffigwr/ffigyrau

Final Terfynol

Finite Meidraidd

First Cyntaf

Force/s Grym/oedd

Formula/e Fformiwla/Fformiwlȃu

Fraction/s Ffracsiwn/ffracsiynau

Frequency Amledd/amlder

Frequency total Cyfanswm amlder

Friction Ffrithiant

Function/s Ffwythiant/Ffwythiannau

Geometric Geometrig

Geometry Geometreg

Gradient/s Graddiant/Graddiannau

Gram/s Gram/au

Graph/s Graff/iau

Gravity Disgyrchiant

Grid/s Grid/iau

Group/s Grŵp / Grwpiau

(To) group Grwpio

Half/halves Hanner/haneri

(To) half Haneru

Height/s Uchder/au

Hence Dyna pam

Heptagon Heptagon

Hexagon Hecsagon

High Uchel

Higher Uwch

Highest Uchaf

Horizontal Llorweddol

Horizontal axis Echelin lorweddol

Hundred/s Cant/Cannoedd

Hyperbola Hyperbola

Hyperbolic Hyperbolig

Hypotenuse/s Hypotnws/Hypotenysau

Hypothesis Rhagdybiaeth

Improper (fraction) Pendrwm

(To) increase Cynyddu

Index(power) Pŵer

Index/indices Indecs/au

Inextensible Anestynadwy

(To) infer Casglu

Inference Casgliad

Infinite Anfeidraidd

Infinity Anfeidredd

Initial Cychwynnol

In proportion to Mewn cyfrannedd ȃ

Input/s Mewnbwn/mewnbynnau

Interquartile/s Rhyngchwartel/au

Integer/s Cyfanrif/au

(To) integrate Integru

(To) intercept Rhyngdorri

Interest Llog

Interior angle Ongl fewnol

(To) intersect Croestorri

Intersection/s Croestoriad/au

Inverse Gwrthdro

In words Mewn geiriau

Irrational Anghymarebol

(To) iterate Iteru

Iteration Iteriad

Kinetmatics Cinemateg

Label Label

(To) label Labelu

Length/s Hyd/oedd

Lamina Lamina

Large Mawr

Larger Mwy

Largest Mwyaf

Less Llai

Light Ysgafn

Linear Llinol

Line graph Graff llinell

Line of symmetry Llinell gymesuredd

Litre/s Litr/au

Little Ychydig

Locus/loci Locws/locysau

Logarithm/s Logarithm/au

Logarithmic Logarithmig

Loss Colled

Lower Is

Magnitude/s Maint/Meintiau

Mass/es Mās

Matrix/Matrices Matrics/au

Maximum Mwyafrif / macsimwm

Mean Cymedr

(To)measure Mesur

Measurement Mesuriad

Median Canolrif/au

Metre/s Metr/au

Metric Metrig

Mid-point Canolbwynt

Minimum(least) Lleiafrif / minimwm

Minimum (smallest number)- Minus(subtract) Tynnu

Minus(negative) Minws / negatif

Mode Modd

Moment/s Moment/au

Money Arian

Motion Mudiant

Multiple/s Lluosrif/au

(To) multiply Lluosi

Multiplication/s Lluosiad/au

Negative Negatif

Negative number Rhif negatif

Net/s Rhwyd/i

Nonagon Nonagon

North/Northern Gogledd/Gogleddol

Number/s Nifer/oedd

Oblique angle Ongl arosgo

Obtuse Aflem

Obtuse angle Ongl aflem

Obtuse angled triangle Triongl ongl aflem

Octagon Octagon

Odd number/s Odrif/au

Opposite Cyferbyn

Optimisation Optimeiddiaeth

(To) optimise Optimeiddio

Order Trefn

Origin Tarddiad / tarddbwynt

Orthogonal Orthogonol

Otherwise Fel arall

Output/s Allbwn/allbynnau

Paper/s Papur/au

Parabola Parabola

Parabolic Parabolig

Parallel Paralel

Parallelogram Paralelogram

Parametric Parametrig

Part/s Rhan/nau

Partial Rhannol

Pattern/s Patrwm/patrymau

Pentagon Pentagon

Percentage/s Canran/nau

Perception/s Canfyddiad/au

Perimeter/s Perimedr/au

Perpendicular Perpendicwlar

Pi Pi

Pie chart Siart cylch

Pictogram/s Pictogram/au

Pictograph/s Pictograff/iau

(To) plot Plotio

Plus Plws

Point/s Pwynt/iau

Polygon Polygon

Polynomial/s Polynomial/au

Population/s Poblogaeth/au

Position/s Safle/oedd

Positive Positif

Power of 10 Pwerau o 10

Prime Cysefin

Principle/s Egwyddor/ion

Probability Tebygolrwydd

Product Lluoswm

Profit Elw

Progression Dilyniant

Proof Prawf

Property/properties Priodwedd/au

Proportion/s Cyfrannedd/cyfraneddau

Protractor Onglydd

(To) prove Profi

Pulley/s Pwli/Pwlïau

Pyramid/s Pyramid/au

Quadratic Cwadratig

Quadratic equation Hafaliad cwadratig

Quadrilateral Pedrochr

Quartile Chwartel

Question/s Cwestiwn/cwestiynau

Quotient/s Cyniferydd/ion

Radius Radiws/radiysau

Random Ar hap

Range Amrediad

Ratio Cymhareb

Rational Cymarebol

(To) read Darllen

Reciprocal/s Cilydd/ion

Rectangle/s Petryal/au

(To) reduce Lleihau

(To) reflect Adlewyrchu

Reflection Adlewyrchiad

Reflex Atblyg

Reflex angle Ongl atblyg

Regression Atchweliad

Regular Rheolaidd

Remainder Gweddill

Respectively Yn ôl eu trefn

Result/s Canlyniad/au

Rhombus Rhombws

(To) revise Adolygu

Right angle Ongl sgwâr

Right angled triangle Triongl ongl sgwâr

Root/s Isradd/Israddau

(To) rotate Cylchdroi

Rotation Cylchdro/cylchdroad

Rough Bras

Rough estimate Brasamcan

(To) round up Talgrynnu

Rule/s Rheol/au

Ruler Pren mesur

Sample/s Sampl/au

Scale/s Graddfa/graddfeydd

Scatter Gwasgaru

Second Ail

Semi-circle Hanner-cylch

Set/s Set/iau

Shape/s Siâp / Siapiau

(To) show Dangos

Side/s Ochr/au

Sign/s Arwydd/ion

Similar Tebyg

Simultaneous Cydamserol

Simultaneous equation Hafaliad cydamserol

(To) sketch Braslunio

Skew Sgiw

Skewness Sgiwedd

Solution/s Datrysiad/au

(To) solve Datrys

South/Southern De/Deheuol

Speed Cyflymder/cyflymdra / buanedd

Sphere Sffêr

Square/s Sgwâr / Sgwariau

(To) square Sgwario

Square root Ail-isradd

Standard Safonol

Static Statig

Stationary Sefydlog

Statistics(concept) Ystadegaeth

Statistic/s Ystadegyn/ystadegau

Straight Syth

Stratified Haenedig

(To) stretch Ymestyn

(To) substitute Amnewid

Substitution Amnewidiad

(To) subtract Tynnu

Sum/s Sym/iau

Sum(total) Cyfanswm

Surd/s Swrd/Syrdiau

Survey Arolwg

Symbol/s Symbol/au

Symmetry Cymesuredd

System/s Systema/au

Tally (to keep a tally) Cadw cyfrif

(To) take/assume Cymryd

Term/s Term/au

Therefore Felly

Three times Teirgwaith

Time Amser

Total Cyfanswm

Transformation Trawsffurfiad

Translation Trawsfudiad (geometreg)

Transparent Tryloyw

Trapezium Trapesiwm

Trial and error Cynnig a chynnig / Cynnig a gwella

Triangle/s Triongl/au

Trigonometric Trigonometrig

Trigonometry Trigonometreg

(To) turn Troi

Twice Dwywaith

Type/s Math/au

Unit/s Uned/au

Universal Cyffredinol

Upper Uchaf

(To) use Defnyddio

Value/s Gwerth/oedd

Variable/s Newidyn/nau

Variance Amrywiant

Velocity Buanedd

Vector/s Fector/au

(To) verify Gwireddu

Vertex/Vertices Fertig/au

WithVertical Fertigol

Vertical axis Echelin/au fertigol

Volume/s Cyfaint/Cyfeintiau

Weight/s(pressure) Pwys/au

West/Western Gorllewin/Gorllewinol

Whole Cyfan

Width/s Lled/au

Without Heb

(To) write Ysgrifennu

Zero/es Sero/au

Cymraeg Saesneg

Adio / Ychwanegu (to) add

Adlewyrchiad Reflection

Adlewyrchu (To) reflect

Adlog Compound interest

Adolygu (To) revise

Aflem Obtuse

Ail Second

Ail-isradd Square root

Algebra Algebra

Algorithm/au Algorithm/s

Allanol External

Allbwn/allbynnau Output/s

Amcangyfrif (To) estimate

Amgrwm Convex

Amledd cronnus Cumulative frequency

Amledd/amlder Frequency

Amnewid (To) substitute

Amnewidiad Substitution

Amod/au Condition/s

Amrediad Range

Amrywiant Variance

Amser Time

Anestynadwy Inextensible

Anfeidraidd Infinite

Anfeidredd Infinity

Anghymarebol Irrational

Anwir FALSE

Ar hap Random

Arddangos / dangos (To) demonstrate

Arian Money

Arolwg Survey

Arwahanol Discrete

Arwydd/ion Sign/s

Arwynebedd/au Area/s

Asymptot/au Asymptote/s

Asymptotig Asymptotic

Atblyg Reflex

Atchweliad Regression

Binomial/au Binomial(s)

Bras Rough

Brasamcan Approximation

Brasamcan Rough estimate

Braslunio (To) sketch

Buanedd Velocity

Cadw cyfrif Tally (to keep a tally)

Calcwlws Calculus

Canfyddiad/au Perception/s

Canlyniad/au Result/s

Canolbwynt Mid-point

Canolrif/au Median

Canran/nau Percentage/s

Cant/Cannoedd Hundred/s

Casgliad Inference

Casglu (To) infer

Centimetr/au Centimetre/s

Ceugrwm Concave

Chwartel Quartile

Cilydd/ion Reciprocal/s

Cinemateg Kinetmatics

Ciwb/iau Cube/s

Ciwbig Cubic

Clocwedd Clockwise

Colled Loss

Côn/au Cone/s

Croesi (To) cross

Croeslin/iau Diagonal/s

Croestoriad/au Intersection/s

Croestorri (To) intersect

Cromlin/iau Curve/s

Cwadratig Quadratic

Cwestiwn/cwestiynau Question/s

Cwmpawd Compass

Cychwynnol Initial

Cydamserol Simultaneous

Cydberthyniad Correlation

Cydbwyso (To) balance

Cydran/nau Component/s

Cyfagos Adjacent

Cyfaint/Cyfeintiau Volume/s

Cyfan Whole

Cyfanrif/au Integer/s

Cyfanswm Sum(total)

Cyfanswm Total

Cyfanswm amlder Frequency total

Cyfartaledd/au Average/s

Cyfeiliornad/au Error/s

Cyfeiriad/au Direction/s

Cyfeiriant/cyfeiriannau Bearing/s

Cyferbyn Opposite

Cyfernod/au Coefficient/s

Cyfesuryn/nau Co-ordinate/s

Cyffredinol Universal

Cyflawn Complete

Cyflymder/cyflymdra / buanedd Speed

Cyflymiad Acceleration

Cyflymu (To) accelerate

Cyfranedd union Direct proportion

Cyfrannedd/cyfraneddau Proportion/s

Cyfrif (To) count

Cyfrifo (To) calculate

Cyfuniad/au Combination/s

Cyfuniadol Combinatorial

Cylch/oedd Circle/s

Cylchdro/cylchdroad Rotation

Cylchdroi (To) rotate

Cylchedd/au Circumference/s

Cymarebol Rational

Cymedr Mean

Cymesuredd Symmetry

Cymhareb Ratio

Cymhariaeth/cymariaethau Comparison/s

Cymhlyg Complex

Cymryd (To) take/assume

Cynhwysedd / cyfaint Capacity

Cyniferydd/ion Quotient/s

Cynnig a chynnig / Cynnig a gwella Trial and error

Cyntaf First

Cynyddu (To) increase

Cysefin Prime

Cysonyn/Cysonion Constant/s

Cytbell neu yr un pellter Equidistant

Dadansoddi (To) Analyse

Dadansoddiad Analysis

Dadleoliad Displacement

Dangos (To) show

Darganfod (To) discover

Darllen (To) read

Data/ gwybodaeth Data/information

Datrys (To) solve

Datrysiad/au Solution/s

De/Deheuol South/Southern

Defnyddio (To) use

Degolyn/degolion Decimal/s

Deilliad Differential

Determinant/Determinannau Determinant/s

Diagram/au Diagram/s

Diamedr/au Diameter/s

Di-dor Continuous

Differu (To) differentiate

Digid/au Digit/s

Dihysbyddiad Exhaustion

Dilyniant Progression

Dimensiwn/dimensiynau Dimension/s

Disgyrchiant Gravity

Dosbarthiad Distribution

Dwyrain/ Dwyreiniol East/ Eastern

Dwyrannu (To) bisect

Dwysedd Density

Dwywaith Twice

Dyblu (To) double

Dyna pam Hence

Dynamig Dynamic

Echelin lorweddol Horizontal axis

Echelin/au Axis/axes

Echelin/au fertigol Vertical axis

Ecwilibriwm Equilibrium

Egwyddor/ion Principle/s

Eilrif/au Even number/s

Elips/au Ellipse/s

Eliptig Elliptic

Elw Profit

Enrhifo (To) evaluate

Esbonydd/ion Exponent/s

Esbonyddol Exponential

Fector/au Vector/s

Fel arall Otherwise

Felly Therefore

Fertig/au Vertex/Vertices

Fertigol WithVertical

Ffactor/au Factor/s

Ffactorial Factorial

Ffactorio (To) factorise

Ffaith/ffeithiau Fact/s

Ffigwr/ffigyrau Figure/s

Fformiwla/Fformiwlȃu Formula/e

Ffracsiwn/ffracsiynau Fraction/s

Ffrithiant Friction

Ffwythiant/Ffwythiannau Function/s

Geometreg Geometry

Geometrig Geometric

Gogledd/Gogleddol North/Northern

Gorllewin/Gorllewinol West/Western

Gradd/au Degree/s

Graddfa/graddfeydd Scale/s

Graddiant/Graddiannau Gradient/s

Graff bar Bar graph

Graff llinell Line graph

Graff/iau Graph/s

Gram/au Gram/s

Grid/iau Grid/s

Grŵp / Grwpiau Group/s

Grwpio (To) group

Grym/oedd Force/s

Gwahaniaeth/au Difference/s

Gwahaniaethiad Differentiation

Gwahanolyn/Gwahanolion Discriminant/s

Gwasgariad Dispersal

Gwasgaru Scatter

Gweddill Remainder

Gwerth/oedd Value/s

Gwireddu (To) verify

Gwirio (To) check

Gwrthbrawf Disproof

Gwrthbrofi (To) disproove

Gwrthddywediad/au Contradiction/s

Gwrthdro Inverse

Gwrth-glocwedd Anti-clockwise

Haenedig Stratified

Hafal Equal

Hafaliad cwadratig Quadratic equation

Hafaliad cydamserol Simultaneous equation

Hafaliad/au Equation/s

Hafalochrog Equilateral

Hafalu (To) equate

Haneru (To) half

Hanner/haneri Half/halves

Hanner-cylch Semi-circle

Heb Without

Hecsagon Hexagon

Helaethiad/au Enlargement/s

Heptagon Heptagon

Hyd/oedd Length/s

Hyperbola Hyperbola

Hyperbolig Hyperbolic

Hypotnws/Hypotenysau Hypotenuse/s

Indecs/au Index/indices

Integru (To) integrate

Is Lower

Isradd/Israddau Root/s

Iteriad Iteration

Iteru (To) iterate

Label Label

Labelu (To) label

Lamina Lamina

Litr/au Litre/s

Llai Less

Lle degol Decimal place

Lled Breadth

Lled/au Width/s

Lleiafrif / minimwm Minimum(least)

Lleihau (To) reduce

(L)lem Acute

Llinell gymesuredd Line of symmetry

Llinol Linear

Llog Interest

Llorweddol Horizontal

Llunio (To) construct

Lluosi (To) multiply

Lluosiad/au Multiplication/s

Lluosrif/au Multiple/s

Lluoswm Product

Locws/locysau Locus/loci

Logarithm/au Logarithm/s

Logarithmig Logarithmic

Maint/Meintiau Magnitude/s

Mās Mass/es

Math/au Type/s

Matrics/au Matrix/Matrices

Mawr Big

Mawr Large

Meidraidd Finite

Mesur (To)measure

Mesuriad Measurement

Metr/au Metre/s

Metrig Metric

Mewn cyfrannedd ȃ In proportion to

Mewn geiriau In words

Mewnbwn/mewnbynnau Input/s

Minws / negatif Minus(negative)

Modd Mode

Moment/au Moment/s

Mudiant Motion

Mwy Bigger

Mwy Larger

Mwyaf Biggest

Mwyaf Largest

Mwyafrif / macsimwm Maximum

Mynegiad Expression

Negatif Negative

Newidyn/nau Variable/s

Nifer/oedd Amount/Number

Nifer/oedd Number/s

Nonagon Nonagon

Ochr/au Side/s

Octagon Octagon

Odrif/au Odd number/s

Ongl aflem Obtuse angle

Ongl arosgo Oblique angle

Ongl atblyg Reflex angle

Ongl fewnol Interior angle

Ongl gylchdro Angle of rotation

Ongl lem Acute angle

Ongl sgwâr Right angle

Ongl/au Angle/s

Ongl/au cyfatebol Corresponding angle/s

Ongl/au cyflenwol Complementary angle/s

Ongl/au eiledol Alternate angle/s

Onglydd Protractor

Optimeiddiaeth Optimisation

Optimeiddio (To) optimise

Orthogonol Orthogonal

Papur/au Paper/s

Parabola Parabola

Parabolig Parabolic

Paralel Parallel

Paralelogram Parallelogram

Parametrig Parametric

Patrwm/patrymau Pattern/s

Pedrochr Quadrilateral

Pellter/au Distance/s

Penderfynu (To) decide

Pendrwm Improper (fraction)

Pennu Determine

Pentagon Pentagon

Perimedr/au Perimeter/s

Perpendicwlar Perpendicular

Petryal/au Rectangle/s

Pi Pi

Pictograff/iau Pictograph/s

Pictogram/au Pictogram/s

Plotio (To) plot

Plws Plus

pob(ym mhob un) Each(in each one)

Poblogaeth/au Population/s

Polygon Polygon

Polynomial/au Polynomial/s

Positif Positive

Prawf Proof

Pren mesur Ruler

Priodwedd/au Property/properties

Profi (To) prove

Pŵer Index(power)

Pwerau o 10 Power of 10

Pwli/Pwlïau Pulley/s

Pwynt degol Decimal point

Pwynt/iau Point/s

Pwys/au Weight/s(pressure)

Pyramid/au Pyramid/s

Radiws/radiysau Radius

Rhagdybiaeth Hypothesis

Rhan/nau Part/s

Rhanadwy Divisible

Rhannol Partial

Rhannu (To) divide

Rheol/au Rule/s

Rheolaidd Regular

Rhif negatif Negative number

Rhifyddeg Arithmetic

Rhombws Rhombus

Rhwyd/i Net/s

Rhyngchwartel/au Interquartile/s

Rhyngdorri (To) intercept

Safle/oedd Position/s

Safonol Standard

Sampl/au Sample/s

Sefydlog Stationary

Sero/au Zero/es

Set/iau Set/s

Sffêr Sphere

Sgiw Skew

Sgiwedd Skewness

Sgwâr / Sgwariau Square/s

Sgwario (To) square

Siâp / Siapiau Shape/s

Siart cylch Pie chart

Siart/iau Chart/s

Silindr/au Cylinder/s

Statig Static

Swrd/Syrdiau Surd/s

Sylfaen Base

Sym/iau Sum/s

Symbol/au Symbol/s

Systema/au System/s

Syth Straight

Talgrynnu (To) round up

Tan/Islaw Below

Tan/Islaw Beneath

Tarddiad / tarddbwynt Origin

Tebyg Similar

Tebygolrwydd Probability

Teirgwaith Three times

Terfynol Final

Term/au Term/s

Trapesiwm Trapezium

Trawsffurfiad Transformation

Trawsfudiad (geometreg) Translation

Trawstoriad Cross-section

Trefn Order

Trigonometreg Trigonometry

Trigonometrig Trigonometric

Triongl hafalochrog Equilateral triangle

Triongl ongl aflem Obtuse angled triangle

Triongl ongl lem Acute angled triangle

Triongl ongl sgwâr Right angled triangle

Triongl/au Triangle/s

Troi (To) turn

Trydydd isradd Cube root

Tryloyw Transparent

Tybiaeth/au Assumption/s

Tybio (To) assume/take

Tynnu Minus(subtract)

Tynnu (To) subtract

Uchaf Highest

Uchaf Upper

Uchder/au Height/s

Uchel High

Uned/au Unit/s

Uwch Higher

Wyneb/au Face/s

Ychydig Little

Ymestyn (To) stretch

Yn ôl eu trefn Respectively

Ysgafn Light

Ysgrifennu (To) write

Ystadegaeth Statistics(concept)

Ystadegyn/ystadegau Statistic/s

Yw/ ydy neu yn hafal i Equals