WordReference Random House Unabridged Dictionary of American English © 2026
trid•y•mite
(trid′ə mīt′),USA pronunciation n. [Mineral.]
- a polymorph of quartz occurring in the form of small crystals, commonly twinned, in siliceous volcanic rocks.
- German Tridymit, equivalent. to tridym- (Greek trídym(os) triple, equivalent. to tri- tri- + (dí)dymos didymous) + -it -ite1
- 1865–70
'tridymite' also found in these entries (note: many are not synonyms or translations):