Earthnut
WordNet
noun
(1) Edible subterranean fungus of the genus Tuber
(2) Pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms
(3) A common European plant having edible tubers with the flavor of roasted chestnuts
(4) Any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe
WiktionaryText