Definition
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Pedair
Pedair yw'r rhif sy'n dilyn tri ac yn cynrychioli nifer pedwar.
Four is the number that follows three and represents the quantity four.
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Mae pedair coeden yn y gerddi.
There are four trees in the gardens.
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Cafodd e pedair mlynedd i gwblhau'r astudiaeth.
He was given four years to complete the study.
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Rydw i'n prynu pedair eira ar gyfer y teulu.
I am buying four ice creams for the family.