Source : Webster's Revised Unabridged Dictionary (1913)

Heterogamous \Het`er*og"a*mous\, a. [Hetero- + Gr. ga`mos
   marriage: cf. F. h['e]t['e]rogame.] (Bot. & Biol.)
      (a) The condition of having two or more kinds of flowers
          which differ in regard to stamens and pistils, as in
          the aster.
      (b) Characterized by heterogamy.