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[mang-guh-nees, -neez] /ˈmæŋ gəˌnis, -ˌniz/
noun, Chemistry.
a hard, brittle, grayish-white, metallic element, an oxide of which, MnO 2 (manganese dioxide) is a valuable oxidizing agent: used chiefly as an alloying agent in steel to give it toughness. Symbol: Mn; atomic weight: 54.938; atomic number: 25; specific gravity: 7.2 at 20°C.
Origin of manganese
1670-80; < French manganèse < Italian manganese, alteration of Medieval Latin magnesia magnesia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for manganese
Contemporary Examples
  • The fact that the Rio Grande rise also harbors traces of iron and manganese was not lost on the minerals industry.

Historical Examples
  • Black oxyde of manganese is also used in small quantities, with the view of rendering the glass more colorless and transparent.

  • The manganese ores are mined principally in the oxidized zone.

  • The critical percentage where the amount of manganese appears to give the greatest efficiency seems to be 0.02%.

    Paint Technology and Tests Henry A. Gardner
  • It is an advantage to add granulated carbon to the manganese.

  • In both these cases the oxygen is generated by heating a mixture of chlorate of potash and manganese black oxide.

    Optical Projection Lewis Wright
  • The atomic weight of manganese has been frequently determined.

  • The quality of the manganese ores, however, is low, and reserves of chromium are insufficient for the needs of the economy.

    Area Handbook for Bulgaria Eugene K. Keefe, Violeta D. Baluyut, William Giloane, Anne K. Long, James M. Moore, and Neda A. Walpole
  • At the center of the cell is a rod of carbon and manganese dioxide.

    Physics Willis Eugene Tower
  • That meant both piles of manganese that lay on the gallery next the crane were to be shoveled in—double time for us, in the heat.

    Steel Charles Rumford Walker
British Dictionary definitions for manganese


a brittle greyish-white metallic element that exists in four allotropic forms, occurring principally in pyrolusite and rhodonite: used in making steel and ferromagnetic alloys. Symbol: Mn; atomic no: 25; atomic wt: 54.93805; valency: 1, 2, 3, 4, 6, or 7; relative density: 7.21–7.44; melting pt: 1246±3°C; boiling pt: 2062°C
Word Origin
C17: via French from Italian manganese, probably altered form of Medieval Latin magnesia
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for manganese

1670s as the name of a mineral, oxide of manganese, from French manganèse (16c.), from Italian manganese, alteration or corruption of Medieval Latin magnesia (see magnesia). From 1783 in English as the name of an element.

Online Etymology Dictionary, © 2010 Douglas Harper
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manganese in Medicine

manganese man·ga·nese (māng'gə-nēz', -nēs')
Symbol Mn
A brittle metallic element, having several allotropes. It is alloyed with steel to increase strength. Atomic number 25; atomic weight 54.9380; melting point 1,246°C; boiling point 2,061°C; specific gravity 7.21 to 7.44; valence 1, 2, 3, 4, 6, 7.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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manganese in Science
Symbol Mn
A grayish-white, hard, brittle metallic element that occurs in several different minerals and in nodules on the ocean floor. It is used to increase the hardness and strength of steel and other important alloys. Atomic number 25; atomic weight 54.9380; melting point 1,244°C; boiling point 1,962°C; specific gravity 7.21 to 7.44; valence 1, 2, 3, 4, 6, 7. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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