Groundnut
Groundnut (ground"nut`) , noun
(a)
(Botany) The fruit of the Arachis hypogaa (native country uncertain); the peanut; the earthnut.
(b)
(Botany) A leguminous, twining plant (Apios tuberosa), producing clusters of dark purple flowers and having a root tuberous and pleasant to the taste.
(c)
(Botany) The dwarf ginseng (Aralia trifolia).
(d)
(Botany) 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. [United States] — Gray