Emily Dickinson Lexicon

TRUF'FLE, n. [Fr. truffe; Sp. trufa, deceit, imposition, and truffles; and if this vegetable is named from its growth under ground, it accords with It. traffare, to deceive.]

A subterraneous vegetable production, a kind of mushroom, of a fleshy fungous structure and roundish figure; an esculent substance, much esteemed. It is of the genus Tuber. Cyc.