manganese

4 definitions found

manganese - Collaborative International Dictionary of English v.0.48 :

  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]

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

manganese - WordNet (r) 2.1 (2005) :

  manganese
      n 1: a hard brittle grey polyvalent metallic element that
           resembles iron but is not magnetic; used in making steel;
           occurs in many minerals [syn: manganese, Mn, atomic number 25
           ]

manganese - Elements (07Nov00) :

  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.