periclase

[ per-i-kleys, -kleyz ]
/ ˈpɛr ɪˌkleɪs, -ˌkleɪz /

noun

a cubic mineral, native magnesia, MgO, occurring usually in metamorphosed dolomite.

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Origin of periclase

1835–45; <German Periklas<New Latin periclasia, equivalent to peri-peri- + Greek klás(is) a breaking (cf. -clase) + -ia-ia
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for periclase

periclase
/ (ˈpɛrɪˌkleɪs) /

noun

a mineral consisting of magnesium oxide in the form of isometric crystals or grains: occurs in metamorphosed limestone

Derived forms of periclase

periclastic (ˌpɛrɪˈklæstɪk), adjective

Word Origin for periclase

C19: from New Latin periclasia, from Greek peri very + klasis a breaking, referring to its perfect cleavage
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012