opals

noun

  1. 1

    A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.

  2. 2

    A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."

  3. 3

    Any of various lycaenid butterflies of the genus Nesolycaena.

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