earthnut

(noun) any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe. Synonyms: truffle, earth-ball.

(noun) a common European plant having edible tubers with the flavor of roasted chestnuts. Synonyms: Conopodium denudatum.

(noun) pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms. Synonyms: peanut, goober, goober pea, groundnut, monkey nut.

(noun) edible subterranean fungus of the genus Tuber. Synonyms: truffle.