Etymology: International Scientific Vocabulary, back-formation from trimorphism
: any of the three crystalline forms of a trimorphous substance
rutile, brookite, and anatase are trimorphs of titanium dioxide
* * *
/truy"mawrf/, n. Crystall.
1. a substance existing in three structurally distinct forms; a trimorphous substance.
2. any of the three forms.
[1905-10; < Gk trímorphos having three forms. See TRI-, -MORPH]
Useful english dictionary. 2012.