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manganese

[mang-guh-nees, -neez]
noun Chemistry.
  1. a hard, brittle, grayish-white, metallic element, an oxide of which, MnO2 (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.
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Origin of manganese

1670–80; < French manganèse < Italian manganese, alteration of Medieval Latin magnesia magnesia
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for manganese

manganese

noun
  1. 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
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Word Origin for manganese

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

Word Origin and History for manganese

n.

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

manganese in Medicine

manganese

(mănggə-nēz′, -nēs′)
n. Symbol Mn
  1. A brittle metallic element, having several allotropes. It is alloyed with steel to increase strength. Atomic number 25.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

manganese in Science

manganese

[mănggə-nēz′]
Mn
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.