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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