Source : Webster's Revised Unabridged Dictionary (1913)

Biceps \Bi"ceps\, n. [L., two-headed; bis twice + caput head.
   See {Capital}.] (Anat.)
   A muscle having two heads or origins; -- applied particularly
   to a flexor in the arm, and to another in the thigh.

Source : WordNet®

biceps
     n : any skeletal muscle having two origins (but especially the
         muscle that flexes the forearm)