Definition of dioptase in English:

dioptase

Syllabification: di·op·tase
Pronunciation: /dīˈäptās, -tāz
 
/

noun

  • A rare mineral occurring as emerald green or blue-green crystals. It consists of a hydrated silicate of copper.
    More example sentences
    • For digital photography, SoLux bulbs are perfect, yielding accurate rendition of difficult-to-photograph minerals such as dioptase and azurite.
    • Many of the best Tsumeb cerussite, dioptase, azurite, smithsonite, and other specimens passed through his hands en route to some faraway collection.
    • Tantara dioptase occurs well crystallized with quartz, plancheite, shattuckite, fornacite, and chrysocolla.

Origin

early 19th century: from French, formed irregularly from Greek dioptos 'transparent'.

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Pronunciation: məˈlôrd
noun
used to address an English nobleman