English

Definition of oat adjective from the Oxford Advanced Learner's Dictionary

 

oat

 adjective
adjective
BrE BrE//əʊt//
 
; NAmE NAmE//oʊt//
 
[only before noun]
 
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made from or containing oats oat cakes oat bran see also oatmeal Word Origin Old English āte, plural ātan, of unknown origin. Unlike other names of cereals (such as wheat, barley, etc.), oat is not an uncountable noun and may originally have denoted the individual grain, which may imply that oats were eaten in grains and not as meal.
See the Oxford Advanced American Dictionary entry: oat