Source : Webster's Revised Unabridged Dictionary (1913)

Capercailzie \Ca"per*cail`zie\, or Capercally \Ca"per*cal`ly\,
   n. [Gael, capulcoile.] (Zo["o]l.)
   A species of grouse ({Tetrao uragallus}) of large size and
   fine flavor, found in northern Europe and formerly in
   Scotland; -- called also {cock of the woods}. [Written also
   {capercaillie}, {capercaili}.]

Source : WordNet®

capercaillie
     n : large black Old World grouse [syn: {capercailzie}, {horse of
         the wood}, {Tetrao urogallus}]