dimorphiteMin.|daɪˈmɔːfaɪt| [mod.f.Gr. δίµορϕ-ος of two forms + -ite.] A sulphide of arsenic occurring in very small orange-coloured crystals of two different forms. Also called diˈmorphine. 1852Shepard Min. 351 Dimorphine.1868Dana Min. 28 Dimorphite.