trimorph

[ trahy-mawrf ]
/ ˈtraɪ mɔrf /

noun Crystallography.

a substance existing in three structurally distinct forms; a trimorphous substance.
any of the three forms.

Origin of trimorph

First recorded in 1905–10, trimorph is from the Greek word trímorphos having three forms. See tri-, -morph

British Dictionary definitions for trimorph

trimorph
/ (ˈtraɪmɔːf) /

noun

a substance, esp a mineral, that exists in three distinct forms
any of the forms in which such a structure exists