The Collaborative International Dictionary of English v.0.48:

Finochio \Fi*no"chi*o\ (?; 277), n. [It. finocchio fennel, LL.
   fenuclum. See Fennel.] (Bot.)
   An umbelliferous plant (F[oe]niculum dulce) having a
   somewhat tuberous stem; sweet fennel. The blanched stems are
   used in France and Italy as a culinary vegetable.
   [1913 Webster]