GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       

    Manganese , n. [F. manganèse, 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° 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
    ☞ 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
    
      
    
  2.       

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

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