Topaz definition

tōpăz
A colorless, blue, yellow, brown, or pink orthorhombic mineral valued as a gem. Topaz occurs as transparent or translucent prisms in silica-rich igneous rocks, such as pegmatite, and in tin-bearing rock veins. Chemical formula: Al2SiO4(F,OH)2.
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A light yellow variety of quartz.
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A colorless, blue, yellow, brown, or pink aluminum silicate mineral, often found in association with granitic rocks and valued as a gemstone, especially in the brown and pink varieties.
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Any of various yellow gemstones, especially a yellow variety of sapphire or corundum.
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A light-colored or colorless, very hard, orthorhombic mineral, Al2(SiO4)(F,OH)2, often used as a gem; hydrous aluminum silicate.
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Any of a various yellowish minerals that resemble yellow topaz, esp. citrine.
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Either of two brightly colored hummingbirds (Topaza pyra or T. pella) of South America.
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Any of various yellow gemstones, especially a yellow variety of sapphire or corundum.
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A clear, yellowish-brown gemstone.
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A yellowish-brown color, like that of the gemstone.

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(historical, British India) A black Catholic soldier in the British Army.
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Of a yellowish-brown color, like that of the gemstone.
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Other Word Forms

Noun

Singular:
topaz
Plural:
topazes

Origin of topaz

  • Middle English topace from Old French from Latin topazus from Greek topazos

    From American Heritage Dictionary of the English Language, 5th Edition

  • From the Ancient Greek proper noun Τοπάζιος (Topazios), ancient name of St. John's Island, Egypt, in the Red Sea, believed to be the first discovered source of the mineral τοπάζιον (topazion, “peridot").

    From Wiktionary