Source : Webster's Revised Unabridged Dictionary (1913)

Rooster \Roost"er\, n.
   The male of the domestic fowl; a cock. [U.S.]

         Nor, when they [the Skinners and Cow Boys] wrung the
         neck of a rooster, did they trouble their heads whether
         he crowed for Congress or King George.   --W. Irving.

Source : WordNet®

rooster
     n : adult male chicken [syn: {cock}]