Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A mineral form of magnesium oxide, MgO, usually occurring in cubic crystals or grains.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A cubic crystalline form of magnesium oxide (MgO)

from the GNU version of the Collaborative International Dictionary of English

  • n. A grayish or dark green mineral, consisting essentially of magnesia (magnesium oxide), occurring in granular forms or in isometric crystals.

from The Century Dictionary and Cyclopedia

  • n. A rare mineral consisting of magnesia (MgO) with a little iron protoxid.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a white solid mineral that occurs naturally as periclase; a source of magnesium

Etymologies

German Periklas : Greek peri-, intensive pref.; see peri- + Greek klasis, breaking (from its perfect cleavage); see orthoclase.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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