DIMORPHOUS
dimorphic, dimorphous
(adjective) occurring or existing in two different forms; “dimorphic crystals”; “dimorphous organisms”
Source: WordNet® 3.1
Adjective
dimorphous (not comparable)
Dimorphic; occurring or existing in two different forms.
Source: Wiktionary
Di*mor"phous, a. Etym: [Cf. F. dimorphe.]
1. (Biol.)
Definition: Characterized by dimorphism; occurring under two distinct
forms, not dependent on sex; dimorphic.
2. (Crystallog.)
Definition: Crystallizing under two forms fundamentally different, while
having the same chemical composition.
Source: Webster’s Unabridged Dictionary 1913 Edition