Manganese

4 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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 (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.
           [1913 Webster]
  
     {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.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Mn \Mn\, n. (Chem.)
     The chemical symbol for {manganese}.
     [PJC]

From WordNet (r) 2.0 [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.