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manganese

[ mang-guh-nees, -neez ]

noun

, Chemistry.
  1. a hard, brittle, grayish-white, metallic element, an oxide of which, MnO 2 manganese dioxide, is a valuable oxidizing agent: used chiefly as an alloying agent in steel to give it toughness. : Mn; : 54.938; : 25; : 7.2 at 20°C.


manganese

/ ˈmæŋɡəˌniːz /

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
“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


manganese

/ mănggə-nēz′ /

  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.


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Word History and Origins

Origin of manganese1

1670–80; < French manganèse < Italian manganese, alteration of Medieval Latin magnesia magnesia
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Word History and Origins

Origin of manganese1

C17: via French from Italian manganese, probably altered form of Medieval Latin magnesia
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Example Sentences

At that time, Watts was served by two groundwater wells with elevated levels of naturally occurring iron and manganese.

Among other things, the silt at the bottom of the deep sea, which will be stirred up when extracting manganese nodules, for example, is a major concern.

Here, the team modeled diffusion in multicomponent alloys, which are metals composed of five different elements -- manganese, cobalt, chromium, iron and nickel in this research -- in equal amounts.

Kombu is also an unassuming health boost; as noted by Dr. Josh Axe with Dr. Axe, it "offers tons of minerals, such as calcium, copper, iron, magnesium, manganese, molybdenum, phosphorus, potassium, selenium, vanadium and zinc."

From Salon

In fact, the team recently succeeded in stabilizing green hydrogen production at a relatively high level using a form of manganese oxide as a catalyst.

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