: a usually amorphous mineral that is a hydrated silica softer and less dense than quartz and typically with definite and often marked iridescent play of colors and is used especially as a gem

Examples of opal in a Sentence

Recent Examples on the Web
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The dials are vivid and unusual, but thoughtfully paired: jade with pink opal, lapis with lemon chrysoprase and turquoise with coral. Matthew Catellier, Forbes.com, 31 Mar. 2025 The thin silver chain features pearl-petal flowers with faceted opal and glass beads. Ali Faccenda, People.com, 26 Mar. 2025 Have your jeweler prepare it to the exact specifications, as given, and then insert the opal into the setting, as shown. Charles Portis, Harper's Magazine, 28 Feb. 2025 The Toi et Moi, or You and Me, brooch combines opal with double rose-cut tourmaline, aquamarine, chrysoberyl, sapphire, spinel, tsavorite, quartz and white diamond. David Belcher, New York Times, 26 Feb. 2025 See All Example Sentences for opal

Word History

Etymology

Latin opalus, from Greek opallios, ultimately from Sanskrit upala stone, jewel

First Known Use

circa 1586, in the meaning defined above

Time Traveler
The first known use of opal was circa 1586

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Cite this Entry

“Opal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/opal. Accessed 12 Apr. 2025.

Kids Definition

opal

noun
: a mineral with changeable colors that is used as a gem

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