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dioptase

US:USA pronunciation: respellingUSA pronunciation: respelling(dī op′tās)

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WordReference Random House Unabridged Dictionary of American English © 2026

di•op•tase (dī op′tās),USA pronunciation n.

Mineralogya mineral, hydrous copper silicate, CuSiO₃·H₂O, occurring in emerald-green crystals.

French, equivalent. to di- di-³ + Greek optasía view
1795–1805

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