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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Examples

  • MacNeil was using milk of magnesia, which is the hydroxide, for 'gastric acidity'.

    Cum Grano Salis Randall Garrett 1957

  • Magnesium oxide, sometimes called magnesia or magnesia usta, resembles lime in many respects.

    An Elementary Study of Chemistry William McPherson

  • It is then gradually removed one shelf lower as the decomposition increases, until it arrives at the bottom shelf, where it is completely decomposed in the state of magnesia, which is emptied through, E.

    Scientific American Supplement, No. 586, March 26, 1887 Various

  • Pyrophosphate of magnesia, which is the form in which phosphoric oxide is generally weighed, differs from the ordinary phosphate in the proportion of base to acid.

    A Text-book of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer 1886

  • Commercially available opacifiers are based on zirconium silicate, prepared with other additions such as magnesia and zinc oxide.

    5. Simple glaze theory 1993

  • Snyder suggested giving him a tablespoon of milk of magnesia.

    Eisenhower 1956 David A. Nichols 2011

  • Since he had complained about indigestion, Mamie gave her husband milk of magnesia.8

    Eisenhower 1956 David A. Nichols 2011

  • Snyder suggested giving him a tablespoon of milk of magnesia.

    Eisenhower 1956 David A. Nichols 2011

  • Low walls around the site are studded with blue milk of magnesia bottles in wave formations and more than 25,000 seashells.

    Watts Towers: LA's weird masterpiece 2011

  • Since he had complained about indigestion, Mamie gave her husband milk of magnesia.8

    Eisenhower 1956 David A. Nichols 2011

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