Definition of periclase in English:

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periclase

Pronunciation: /ˈpɛrɪkleɪz/
/ˈpɛrɪkleɪs/

noun

[mass noun]
A colourless mineral consisting of magnesium oxide, occurring chiefly in marble and limestone.

Origin

Mid 19th century: from modern Latin periclasia, erroneously from Greek peri 'utterly' + klasis 'breaking' (because it cleaves perfectly).

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