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manganese |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Manganese \Man`ga*nese"\, n. [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, but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc Symbol Mn Atomic weight 54.8. 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 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. {Manganese bronze}, an alloy made by adding from one to two per cent of manganese to the copper and zinc used in brass. From WordNet r 1.6 [wn]: manganese n : 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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