opals

/OW1 P AH0 L Z/

noun

1
A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.
2
A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."
3
Any of various lycaenid butterflies of the genus Nesolycaena.

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