tridymite Meaning, Definition & Usage

  1. noun a mineral form of silica

WordNet


Trid"y*mite noun
Etymology
Gr. threefold. So called in allusion to the supposed threefold nature of the twin crystals.
Definitions
  1. (Min.) Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.

Webster 1913