groundnut

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A climbing vine (Apios americana) of eastern North America, having compound leaves, clusters of fragrant brownish flowers, and small edible tubers.
2. n. Any of several plants having underground tubers or nutlike parts.
3. n. The tuber or nutlike part of such a plant.
4. n. Chiefly British and South Atlantic U.S. A peanut.

Century Dictionary and Cyclopedia

1. n. The ground-pea or peanut, the pod of Arachis hypogœa. See Arachis.
2. n. The earthnut, the tuberous root of Bunium flexuosum, an umbelliferous plant of Europe.—3. The Apios tuberosa of the United States, a leguminous climber with small tuberous roots.

Wiktionary

1. n. A climbing vine, Apios americana, of eastern North America, having fragrant brownish flowers and small edible tubers.
2. n. Any similar plant having underground tubers.
3. n. The nutlike tuber of such a plant; a peanut or monkey nut.

GNU Webster's 1913

1. n. United States, United States The fruit of the Arachis hypogæa (native country uncertain); the peanut; the earthnut.
2. n. United States, United States A leguminous, twining plant (Apios tuberosa), producing clusters of dark purple flowers and having a root tuberous and pleasant to the taste.
3. n. United States The dwarf ginseng (Aralia trifolia).
4. n. 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.

WordNet 3.0

1. n. pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms
2. n. a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans
3. n. nutlike tuber; important food of Native Americans