1) Isomorphic 2) Similarity 1) Isomorphic 
• (a.) Having the quality of isomorphism.
Refers to crystals having the same atomic arrangement. For more information see Crystallography
Refers to crystals having the same atomic arrangement.
I`so·mor'phous adjective [ Iso- + -morphous .] Having the quality of isomorphism. 
Type: Term Pronunciation: ī′sō-mōr′fŭs Definitions: 1. Having the same form or shape, or being morphologically equal. Synonyms: isomorphic
[adj] - (biology) having similar appearance but genetically different
isomorphous Used to describe a chemical compound that is able to crystallize in a form similar to another chemical compound.
Phases with crystal structures of the same type.
isomorphic adjective having similar appearance but genetically different
(of a compound or mineral) capable of crystallizing in a form similar to that of another compound or mineral, used esp. of substances so closely related that they form end members of a series of solid solutions.