opal

IPA: ˈoʊpʌɫ

(mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O.
(gemology) A precious gem, an iridescent gemstone found in the opal-silica mineral substrate (potch)
(biology, genetics, biochemistry) A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."
Any of various lycaenid butterflies of the genus Nesolycaena.
A female given name from English from the precious stone, invented in the nineteenth century.
(Australia) A type of petrol made by British Petroleum designed to be unable to be used for petrol sniffing.
A hamlet in Alberta, Canada
A census-designated place in Virginia
A town in Wyoming

Examples of "opal" in Sentences

But Opal was not ready to move on.
A guide to Australian precious opal.
And it's the same in the Opal deception.
And is used particularly with opal mining.
An Opal release, with no catalogue number.
It may be associated with dolomite and opal.
"The opal is oblong," the crystal-gazer continued,
The black fire opal is the official gemstone of Nevada.
The most durable opal is a solid piece, free from fractures.
Opal is a feminine given name derived from the name of the gemstone opal.
Similarly, the fact that he is ambidextrous was revealed in Opal Deception.
Some of the opal has high water content and may desiccate and crack when dried.
The very word opal comes from the Sanskrit upala, meaning “precious,” which I guess says it all!
Although opal is not a conclusive indicator of a wetter Mars, it does suggest some interesting scenarios.
The town is known as the opal capital of the world because 90% of the world's finest opals are mined there.
The story of the king's opal is the one I know, and though it sounds exactly as though it had been made out of a dream, it is none the less interesting for that, anyone will admit; and this is the story: