Definition of oat
1a : any of several grasses (genus Avena) especially : a widely cultivated cereal grass (A. sativa)
b : a crop or plot of the oat also : the seed of an oat —usually used in plural but singular or plural in construction
2 archaic : a reed instrument made of an oat straw
feel one's oats
: to act in a newly self-confident and often self-important manner
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