earthnut

Definition
(noun) any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe Definition
(noun) a common European plant having edible tubers with the flavor of roasted chestnuts Definition
(noun) pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms Definition
(noun) edible subterranean fungus of the genus Tuber