Periclase

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [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]



From WordNet (r) 2.0 [wn]:

  periclase
       n : a white solid mineral that occurs naturally as periclase; a
           source of magnesium [syn: {magnesia}, {magnesium oxide}]