Source : Webster's Revised Unabridged Dictionary (1913)

Dimorphous \Di*mor"phous\, a. [Cf. F. dimorphe.]
   1. (Biol.) Characterized by dimorphism; occurring under two
      distinct forms, not dependent on sex; dimorphic.

   2. (Crystallog.) Crystallizing under two forms fundamentally
      different, while having the same chemical composition.

Source : WordNet®

dimorphous
     adj : occurring or existing in two different forms; "dimorphic
           crystals"; "dimorphous organisms" [syn: {dimorphic}]