Opal
Part of speech: noun
Definition: 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."
Pearl
Part of speech: verb
Definition: To set or adorn with pearls, or with mother-of-pearl. Used also figuratively.To cause to resemble pearls; to make into small round grains; as, to pearl barley.To resemble pearl or pearls.To give or hunt for pearls; as, to go pearling.to dig the nose of one's surfboard into the water, often on takeoff.
Part of speech: noun
Definition: A fringe or border.A shelly concretion, usually rounded, and having a brilliant luster, with varying tints, found in the mantle, or between the mantle and shell, of certain bivalve mollusks, especially in the pearl oysters and river mussels, and sometimes in certain univalves. It is usually due to a secretion of shelly substance around some irritating foreign particle. Its substance is the same as nacre, or mother-of-pearl. Pearls which are round, or nearly round, and of fine luster, are highly esteemed as jewels, and compare in value with the precious stones.Hence, figuratively, something resembling a pearl; something very precious.Nacre, or mother-of-pearl.A fish allied to the turbot; the brill.A light-colored tern.One of the circle of tubercles which form the bur on a deer's antler.A whitish speck or film on the eye.A capsule of gelatin or similar substance containing some liquid for medicinal application, as ether.A size of type, between agate and diamond.
Example sentence: After the Pearl Harbor attacks, around 120,000 Japanese Americans were jailed in internment camps. If an attack on U.S. soil were perpetrated by people who were not white and Christian, we can be pretty damn sure that racists would have a field day.