Source : Webster's Revised Unabridged Dictionary (1913)

Yucca \Yuc"ca\, n. (Zo["o]l.)
   See {Flicker}, n., 2.

Yucca \Yuc"ca\, n. [NL., from Yuca, its name in St. Domingo.]
   (Bot.)
   A genus of American liliaceous, sometimes arborescent, plants
   having long, pointed, and often rigid, leaves at the top of a
   more or less woody stem, and bearing a large panicle of showy
   white blossoms.

   Note: The species with more rigid leaves (as {Yucca
         aloifolia}, {Y. Treculiana}, and {Y. baccata}) are
         called {Spanish bayonet}, and one with softer leaves
         ({Y. filamentosa}) is called {bear grass}, and {Adam's
         needle}.

   {Yucca moth} (Zo["o]l.), a small silvery moth ({Pronuba
      yuccasella}) whose larv[ae] feed on plants of the genus
      Yucca.

Source : WordNet®

yucca
     n : any of several evergreen plants of the genus Yucca having
         usually tall stout stems and a terminal cluster of white
         flowers; warmer regions of North America