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The Collaborative International Dictionary
Apios tuberosa

Groundnut \Ground"nut`\ (ground"n[u^]t`), n. (Bot.)

  1. The fruit of the Arachis hypog[ae]a (native country uncertain); the peanut; the earthnut.

  2. A leguminous, twining plant ( Apios tuberosa), producing clusters of dark purple flowers and having a root tuberous and pleasant to the taste.

  3. The dwarf ginseng ( Aralia trifolia). [U. S.]
    --Gray.

  4. A European plant of the genus Bunium ( B. flexuosum), having an edible root of a globular shape and sweet, aromatic taste; -- called also earthnut, earth chestnut, hawknut, and pignut.