Source : Webster's Revised Unabridged Dictionary (1913)

Monophyletic \Mon`o*phy*let"ic\, a. [Gr. ? of one tribe, fr. ?
   single + ? clan.] (Biol.)
   Of or pertaining to a single family or stock, or to
   development from a single common parent form; -- opposed to
   {polyphyletic}; as, monophyletic origin.