Source : Webster's Revised Unabridged Dictionary (1913)

Isomorph \I"so*morph\, n. [See {Isomorphous}.]
   A substance which is similar to another in crystalline form
   and composition.

Isomorph \I"so*morph\, n. (Biol.)
   An animal, plant, or group having superficial similarity to
   another, although phylogenetically different.