Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A green, brown, or black splintery, cleavable pyroxene mineral, essentially (Fe,Mg)2Si2O6.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An inosilicate that is an orthorhombic pyroxene

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. A mineral related to pyroxene, but orthorhombic in crystallization.

Etymologies

French hypersthène : hyper-, extreme (from Greek huper-; see hyper-) + Greek sthenos, strength; see segh- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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