Definition
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Deg
Y nifer deg yw'r ail rif ar hugain, sy'n dilyn naw ac yn dileu unarddeg.
The number ten is the second number in twenty, following nine and preceding eleven.
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Mae deg yn nifer da i ddechrau gydag.
Ten is a good number to start with.
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Cafodd y plant deg o gathod ar eu pen-blwydd.
The children received ten gifts for their birthday.
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Mae deg yn nifer sy'n ymddangos yn aml mewn rhifedd.
Ten is a number that often appears in mathematics.