▸ noun
1 an Old World cereal plant with a loose, branched cluster of florets, cultivated in cool climates and widely used for animal feed.
Avena sativa, family Gramineae.
▪ (oats) the grain yielded by the oat plant, used as food:
oats are great health value
[with modifier] porridge oats.
▪ used in names of wild grasses related to the cultivated oat, e.g. wild oat.
– ORIGIN Old English āte, plural ātan, of unknown origin. Unlike other names of cereals (such as wheat, barley, etc.), oat is not a mass noun and may originally have denoted the individual grain, which may imply that oats were eaten in grains and not as meal.