Noun

(en-noun)

Any of various large, colourful, deep-bodied pelagic fish of the family Lamprididae.

* 2003 , Margaret M. Smith, Phillip C. Heemstra (editors), Smiths' Sea Fishes'' (Revision of 1977, James Leonard Brierley Smith, ''The Sea Fishes of Southern Africa ), page 398,

A member of the lower epipelagic community, the opah feeds on squid and fishes (including some benthic species) and is usually found well offshore.

* 2006 , Sharon Hamblin, Adventure Guide Maui , page 36,

For a long time, opah' has been thought to be good luck so it was only given away, never sold. ' Opah is a nonschooling open-ocean fish so it's not caught in great quantities.

* 2013 , Roy Yamaguchi, John Harrisson, Roy's Fish and Seafood: Recipes from the Pacific Rim , page 77,

Opah is an extraordinary-looking ocean fish, with an almost perfectly round shape; a comparatively thin, flat profile; a silvery skin, and bright crimson fins.

Noun

(en noun)

(mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula Si]]O₂· n[[water, H₂O.

* {{quote-magazine, date=2012-03

, author=Lee A. Groat , title=Gemstones , volume=100, issue=2, page=128 , magazine=(American Scientist) citation , passage=Although there are dozens of different types of gems, among the best known and most important are […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals , peridot, rhodonite, spinel, tourmaline, turquoise and zircon.)}}

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