English definition of Pearl

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Definition of pearl

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Pearl (n.) 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

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Icy-pearled :: Icy-pearled (a.) Spangled with ice.

Margarite :: Margarite (n.) A mineral related to the micas, but low in silica and yielding brittle folia with pearly luster..

Tharos :: Tharos (n.) A small American butterfly (Phycoides tharos) having the upper surface of the wings variegated with orange and black, the outer margins black with small white crescents; -- called also pearl crescent..

Pearl-eyed :: Pearl-eyed (a.) Having a pearly speck in the eye; afflicted with the cataract.

Pearl :: Pearl (v. i.) To resemble pearl or pearls.

Diaspore :: Diaspore (n.) A hydrate of alumina, often occurring in white lamellar masses with brilliant pearly luster; -- so named on account of its decrepitating when heated before the blowpipe..

Empearl :: Empearl (v. t.) To form like pearls; to decorate with, or as with, pearls; to impearl..

Phillygenin :: Phillygenin (n.) A pearly crystalline substance obtained by the decomposition of phillyrin.

Perlitic :: Perlitic (a.) Relating to or resembling perlite, or pearlstone; as, the perlitic structure of certain rocks. See Pearlite..

Agate :: Agate (n.) A kind of type, larger than pearl and smaller than nonpareil; in England called ruby..

Apophyllite :: Apophyllite (n.) A mineral relating to the zeolites, usually occurring in square prisms or octahedrons with pearly luster on the cleavage surface. It is a hydrous silicate of calcium and potassium..

Aphthae :: Aphthae (n. pl.) Roundish pearl-colored specks or flakes in the mouth, on the lips, etc., terminating in white sloughs. They are commonly characteristic of thrush..

Margaritiferous :: Margaritiferous (a.) Producing pearls.

Pearlstone :: Pearlstone (n.) A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under Perlitic..

Phlogopite :: Phlogopite (n.) A kind of mica having generally a peculiar bronze-red or copperlike color and a pearly luster. It is a silicate of aluminia, with magnesia, potash, and some fluorine. It is characteristic of crystalline limestone or dolomite and serpentine. See Mica..

Tank :: Tank (n.) A small Indian dry measure, averaging 240 grains in weight; also, a Bombay weight of 72 grains, for pearls..

Pearl :: Pearl (n.) A light-colored tern.

Mother-of-pearl :: Mother-of-pearl (n.) The hard pearly internal layer of several kinds of shells, esp. of pearl oysters, river mussels, and the abalone shells; nacre. See Pearl..

Pearl :: Pearl (n.) A size of type, between agate and diamond..

Pearlash :: Pearlash (n.) A white amorphous or granular substance which consists principally of potassium carbonate, and has a strong alkaline reaction. It is obtained by lixiviating wood ashes, and evaporating the lye, and has been an important source of potassium compounds. It is used in making soap, glass, etc..