oat

noun

1. annual grass of Europe and North Africa; grains used as food and fodder (referred to primarily in the plural: `oats')

   noun.plant

   Source: WordNet 3.0

2. seed of the annual grass Avena sativa (spoken of primarily in the plural as `oats')

   noun.food

   Source: WordNet 3.0

3. A well-known cereal grass (<i>Avena sativa</i>), and its edible grain; -- commonly used in the plural and in a collective sense.

   noun

   Source: webster1913