Definition of periclase in English:

periclase

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).

Pronunciation

periclase

/ˈpɛrɪkleɪs//ˈpɛrɪkleɪz/