'Truffle' definitions:

Definition of 'truffle'

noun

Any of various highly prized edible subterranean fungi of the genus Tuber; grow naturally in southwestern Europe [syn: truffle, earthnut, earth-ball]

noun

Edible subterranean fungus of the genus Tuber [syn: truffle, earthnut]

noun

Creamy chocolate candy [syn: truffle, chocolate truffle]

From: GCIDE

Truffle \Truf"fle\ (?; 277), n. [OF. trufle, F. truffe; akin to Sp. trufa, tartufo; of uncertain origin; perhaps from L. tuber a tumor, knob, truffle. Cf. Tuber, Trifle.] Any one of several kinds of roundish, subterranean fungi, usually of a blackish color. The French truffle ({Tuber melanosporum}) and the English truffle (Tuber aestivum) are much esteemed as articles of food. [1913 Webster]
Truffle worm (Zool.), the larva of a fly of the genus Leiodes, injurious to truffles. [1913 Webster]