Cow·pea n.
 1. The seed of one or more leguminous plants of the genus Dolichos; also, the plant itself. Many varieties are cultivated in the southern part of the United States.
 2. Bot. A leguminous plant (Vigna Sinensis, syn. Vigna Catjang) found throughout the tropics of the Old World. It is extensively cultivated in the Southern United States for fodder, and the seed is used as food for man.

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 Vigna sinensis
      n : sprawling Old World annual cultivated especially in southern
          United States for food and forage and green manure [syn:
          cowpea, cowpea plant, black-eyed pea, {Vigna
          unguiculata]