Source : Webster's Revised Unabridged Dictionary (1913)

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.