Source : Webster's Revised Unabridged Dictionary (1913)

Chanticleer \Chan"ti*cleer\ (ch[a^]n"t[i^]*kl[=e]r), n. [F.
   Chanteclair, name of the cock in the Roman du Renart (Reynard
   the Fox); chanter to chant + clair clear. See {Chant}, and
   {Clear}.]
   A cock, so called from the clearness or loudness of his voice
   in crowing.