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

/ˈpɛrɪkleɪz//ˈpɛrɪkleɪs/