From The Collaborative International Dictionary of English v.0.44 [gcide]:
Manganese \Man'ga*nese"\, noun [F. mangan['e]se, It. manganese, sasso magnesio; prob. corrupted from L. magnes, because of its resemblance to the magnet. See {Magnet}, and cf. {Magnesia}.] (Chem.) An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty (melting point 1244[deg] C), but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic number 25; Atomic weight 54.938 [C=12.011]. [1913 Webster +PJC]
Note: An alloy of manganese with iron (called ferromanganese) is used to increase the density and hardness of steel.
{Black oxide of manganese}, {Manganese dioxide} or {Manganese peroxide}, or {Black manganese} (Chem.), a heavy black powder {MnO2}, occurring native as the mineral pyrolusite, and valuable as a strong oxidizer; -- called also familiarly {manganese}. It colors glass violet, and is used as a decolorizer to remove the green tint of impure glass.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Mn \Mn\, noun (Chem.) The chemical symbol for {manganese}. [PJC]
From WordNet (r) 2.0 [wn]:
noun
1: a hard brittle gray polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals [syn: {Mn}, {atomic number 25}]
From Elements database 20001107 [elements]:
manganese Symbol: Mn Atomic number: 25 Atomic weight: 54.938 Grey brittle metallic transition element. Rather electropositive, combines with some non-metals when heated. Discovered in 1774 by Scheele.
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