Definitions

from The Century Dictionary.

  • noun A mineral said to be brought from Magnesia.
  • noun Magnesium oxid (MgO), a white tasteless substance having a feeble alkaline reaction.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) A light earthy white substance, consisting of magnesium oxide (MgO), and obtained by heating magnesium hydrate or carbonate, or by burning magnesium. It has a slightly alkaline reaction, and is used in medicine as a mild antacid laxative. See magnesium.
  • noun (Med. Chem.) a bulky white amorphous substance, consisting of a hydrous basic carbonate of magnesium, and used as a mild cathartic.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun magnesium oxide

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

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

Etymologies

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

[Short for New Latin magnēsia alba, literally, white magnesia : Medieval Latin magnēsia, mineral ingredient in the philosopher's stone (from Greek magnēsiā, a kind of ore, talc or a talclike substance, after Magnēsiē, a region of Thessaly where it was found, from Magnēs, an inhabitant of Thessalian Magnesia) + Latin alba, feminine of albus, white.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Middle English magnesia, from late Latin magnesia, from Ancient Greek μαγνησία, after Μαγνησία, a city name in Thessaly, Lydia, and Asia Minor.

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