TRIDYMITE


Meaning of TRIDYMITE in English

[ 'trɪdɪmʌɪt ]

■ noun a high-temperature form of quartz found as thin hexagonal crystals in some igneous rocks and stony meteorites.

Origin

C19: from Ger. Tridymit , from Gk tridumos 'threefold', because it occurs in groups of three crystals.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.