Word: opal
Phonetic:
/ˈəʊpəl/
Listen:
A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO2·nH2O.
A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."
Any of various lycaenid butterflies of the genus Nesolycaena.
You can find a list of possible crossword clues for OPAL below.