Definition
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Saith ar ddeg
Rhif sy'n dilyn pedair ar ddeg a sy'n cynrychioli'r nifer 17.
A number that follows sixteen and represents the quantity 17.
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Mae gennyf saith ar ddeg o lyfrau i'w darllen.
I have seventeen books to read.
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Cafodd yr ysgol saith ar ddeg o ddisgyblion newydd.
The school got seventeen new students.
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Mae fy mhlentyn yn dathlu ei ben-blwydd yn saith ar ddeg.
My child is celebrating their seventeenth birthday.