Definitions for oat
Random House Webster's College Dictionary
a cereal grass, Avena sativa, cultivated for its edible grain.
Usu., oats. the grain of this plant.
any of several other plants of the genus Avena, as the wild oat.
Archaic. a musical pipe made of an oat straw.
Idioms for oat:
feel one's oats, to feel or show giddy animation. to have a strong sense of one's own power.
Origin of oat:
bef. 900; ME ote, OE āte
annual grass of Europe and North Africa; grains used as food and fodder (referred to primarily in the plural: `oats')
seed of the annual grass Avena sativa (spoken of primarily in the plural as `oats')
A widely cultivated cereal grass, Avena sativa.
The oat stalks made good straw.
Any of several similar grain plants.
The wild red oat is thought to be the ancestor of modern food oats,
The seeds of the oat, harvested as a food crop.
Origin: ote, from ate, from aitōn (compare Old High German eiz, Dutch etter, East Frisian eitel, Old Norse eitill), from h₁eid- (compare Latin aemidus, Old Church Slavonic ядъ, Ancient Greek οἰδέω, Old Armenian այտնում, այտ, Sanskrit इन्दु. For sense development, compare Ancient Greek oídax 'unripe fig' from oîdos 'swelling, tumor'.
a well-known cereal grass (Avena sativa), and its edible grain; -- commonly used in the plural and in a collective sense
a musical pipe made of oat straw