a cereal grass, Avena sativa, cultivated for its edible seed.

Usually, oats. ( used with a singular or plural verb ) the seed of this plant, used as a food for humans and animals.

any of several plants of the same genus, as the wild oat.

Archaic . a musical pipe made of an oat straw. ?

feel one's oats

Informal .

to feel frisky or lively.

to be aware of and use one's importance or power.

sow one's wild oats. wild oat ( def. 3 ) .