- oat - annual grass of Europe and North Africa; grains used as food and fodder (referred to primarily in the plural: `oats')
--1 is a kind of cereal, cereal grass
--1 is a member of Avena, genus Avena
--1 has particulars:cereal oat, Avena sativa; wild oat, wild oat grass, Avena fatua; slender wild oat, Avena barbata; wild red oat, animated oat, Avene sterilis - oat - seed of the annual grass Avena sativa (spoken of primarily in the plural as `oats')
--2 is a kind of grain, food grain, cereal
--2 is a part of cereal oat, Avena sativa - oat - seed of the annual grass Avena sativa (spoken of primarily in the plural as `oats')