noun
oat
OHT/ˈoʊt/
A cereal plant grown for its edible grain.
The branching oat heads rest beside grains and rolled flakes.
Etymology
Old English ate already named the oat grain, so the modern food-and-feed sense continues that meaning. Its deeper origin is uncertain; the suggested connection with Old Norse eitill, “nodule,” would refer to an individual grain.
In context
if you want to make your own oat flour one cup of oats will make about a half of a cup of oat flour