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.
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)