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A light green, monoclinic pyroxene mineral, CaMgSi2O6, used as a gemstone and refractory.

[French : di-, two (from Greek; see di-1) + Greek -opsis, -opsis.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(daɪˈɒpsaɪd; -sɪd)
(Minerals) a colourless or pale-green pyroxene mineral consisting of calcium magnesium silicate in monoclinic crystalline form: used as a gemstone. Formula: CaMgSi2O6
[C19: from di-2 + Greek opsis sight, appearance + -ide]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(daɪˈɒp saɪd, -sɪd)

a varicolored monoclinic pyroxene mineral, calcium magnesium silicate, CaMg(SiO3)2, usu. occurring in crystals.
[1800–10; di-3 + Greek óps(is) appearance + -ide]
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