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1. Biology Similarity in form, as in organisms of different ancestry.
2. Mathematics A one-to-one correspondence between the elements of two sets such that the result of an operation on elements of one set corresponds to the result of the analogous operation on their images in the other set.
3. A close similarity in the crystalline structure of two or more substances of similar chemical composition.
i•so•mor•phous(ˌaɪ səˈmɔr fəs)
(of a chemical compound or mineral) capable of crystallizing in a form similar to that of another compound or mineral.