opal

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See also: Opal, òpal, opál, and opał

English[edit]

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Banded opal, a variety of opal (1)

Etymology[edit]

In Florio’s A World of Words 1598 as opale, from French opale, from Latin opalus, from Byzantine Greek ὀπάλλιος (opallios), from Sanskrit उपल (upala, gem”, “stone)[1].

Pronunciation[edit]

Noun[edit]

opal (plural opals)

  1. (mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.
    • 2012 March 1, Lee A. Groat, “Gemstones”, American Scientist, volume 100, number 2, page 128: 
      Although there are dozens of different types of gems, among the best known and most important are […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals, peridot, rhodonite, spinel, tourmaline, turquoise and zircon.)
  2. (biology, genetics, biochemistry) A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."

Derived terms[edit]

Translations[edit]

References[edit]

  1. ^ Chambers Dictionary of Etymology, Robert K. Barnhart (ed.), Chambers, 1988

Anagrams[edit]


Polish[edit]

Polish Wikipedia has articles on:

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Pronunciation[edit]

Noun[edit]

opal m

  1. (mineralogy) opal

Declension[edit]

Derived terms[edit]