Any of several dark-hulled kinds of cultivated oat; especially the European diploid species Avena strigosa, now chiefly grown for animal fodder and as a cover crop.
Origin
Middle English.
Definition of black oat in US English:
black oat
noun
Any of several dark-hulled kinds of cultivated oat; especially the European diploid species Avena strigosa, now chiefly grown for animal fodder and as a cover crop.