What is "srso4"

Isomorphism \I`so*mor"phism\, n. [Cf. F. isomorphisme.]

1. (Crystallog.) 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 hom[oe]omorphism.

2. (Math.) A one-to-one mapping of one set onto another set which preserves the relations between the elements of the domains of the sets.