the fruit of the arachis hypogaea (native country uncertain); the peanut; the earthnut.-a leguminous, twining plant  (apios tuberosa), producing clusters of dark purple flowers and having a root tuberous and pleasant to the taste.-the dwarf ginseng (aralia trifolia).-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.