The Collaborative International Dictionary of English v.0.48:

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]