'Periclase' definitions:

Definition of 'periclase'

(from WordNet)
noun
A white solid mineral that occurs naturally as periclase; a source of magnesium [syn: periclase, magnesia, magnesium oxide]

Definition of 'Periclase'

From: GCIDE
  • Periclase \Per"i*clase\, Periclasite \Per`i*cla"site\, n. [Pref. peri- + Gr. ? to break.] (Min.) A grayish or dark green mineral, consisting essentially of magnesia (magnesium oxide), occurring in granular forms or in isometric crystals. [1913 Webster]