1) Allotropy 
• (n.) The property which constitutes an allomorph; the change involved in becoming an allomorph.
Al`lo·mor'phism noun (Min.) The property which constitutes an allomorph; the change involved in becoming an allomorph. 
Type: Term Pronunciation: al′ō-mōr′fizm Definitions: 1. Change of shape in cells resulting from mechanical causes, such as flattening from pressure, or to progressive metaplasia, such as the change of bile duct cells into liver cells. 2. The state of being similar in chemical composition but different in form (especially cryst...
allomorphism Variability in crystalline form without change in chemical constitution.
variability in crystalline form without change in chemical constitution. Cf. paramorphism.