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dioptase

 - 1 dictionary result

di⋅op⋅tase

[dahy-op-teys]
–noun
a mineral, hydrous copper silicate, CuSiO3·H2O, occurring in emerald-green crystals.

Origin:
1795–1805; < F, equiv. to di- di- 3 + Gk optasía view
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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