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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hypersthene  \Hy"per*sthene\,  n.  [Gr.  "ype`r  over  +  ?  strength: 
  cf  F.  hyperst[`e]ne.]  (Min.) 
  An  orthorhombic  mineral  of  the  pyroxene  group  of  a  grayish 
  or  greenish  black  color,  often  with  a  peculiar  bronzelike 
  luster  (schiller)  on  the  cleavage  surface.