The meaning of Isomorph and additional information.

Isomorph(n.) A substance which is similar to another in crystalline form and composition.

Isomorphic(a.) Isomorphous.

Isomorphism(n.) A similarity of crystalline form between substances of similar composition, as between the sulphates of barium (BaSO4) and strontium (SrSO4). It is sometimes extended to include similarity of form between substances of unlike composition, which is more properly called homoeomorphism.