1. Change of shape in cells due to 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 differing in form (especially crystalline). [allo- + G. morphe, form]
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al·lo·mor·phism (al″o-morґfiz-əm) [allo- + morph- + -ism] change of crystalline form without change in chemical constitution. Cf. allomerism.Medical dictionary. 2011.