Source : Webster's Revised Unabridged Dictionary (1913)

Bifurcate \Bi*fur"cate\, Bifurcated \Bi*fur"ca*ted\, a. [Pref.
   bi- + furcate.]
   Two-pronged; forked.

Source : WordNet®

bifurcated
     adj : divided into or made up of two parts; "socially bifurcated
           populations"