English Dictionary

opal

/ˈəʊpəl/

noun

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

She wore a beautiful opal necklace.

意味（1）

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

意味（2）

(gemology) A precious gem, an iridescent gemstone found in the opal-silica mineral substrate (potch)

意味（3）

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

意味（4）

Any of various lycaenid butterflies of the genus Nesolycaena.