noun (n)

• dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn(noun.plant)

  Synonym:
  grain
  

  source: wordnet30
• A one-celled, dry, indehiscent fruit, with a thin membranous pericarp, adhering closely to the seed, so that fruit and seed are incorporated in one body, forming a single grain, as of wheat, barley, etc.(noun)

  source: webster1913