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A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luster; -- so called from its becoming grass-green on being subjected to heat under the blowpipe.

A yellow crystalline substance allied to pyrrol, obtained by the distillation of gelatin.

ich two varieties are known, a and g. g-pyrone is the parent substance of several natural yellow dyestuffs.

A yellow crystalline hydrocardon extracted from crude wood spirit; -- called also eblanin.

ial plant (Houstonia cærulea), with pretty four-lobed corollas which are pale blue with a yellowish center; -- also called bluets, and little innocents.

ge of remaining in the mansion house of which her husband died seized. Quarantine flag, a yellow flag hoisted at the fore of a vessel or hung from a building, to give warning of an infectious disease; -- called also the yellow jack, and yellow flag.

g in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque.

pigeon, above. -- Queen's ware, glazed English earthenware of a cream color. -- Queen's yellow (Old Chem.), a heavy yellow powder consisting of a basic mercuric sulphate; -- formerly called turpetum minerale, or Turbith's mineral.

Pertaining to, or designating, a tannic acid found in oak bark and extracted as a yellowish brown amorphous substance.

A yellow crystalline substance, occurring quite widely distributed in the vegetable kingdom, as is apple-tree bark, horse- chestnut leaves, etc., but originally obtained by the decomposition of quercitrin. Called also meletin.

A glucoside extracted from the bark of the oak (Quercus) as a bitter citron-yellow crystalline substance, used as a pigment and called quercitron.

The yellow inner bark of the Quercus tinctoria, the American black oak, yellow oak, dyer's oak, or quercitron oak, a large forest tree growing from Maine to eastern Texas.

k or white, and is much grown for ornament. -- Quince curculio (Zoöl.), a small gray and yellow curculio (Conotrachelus cratægi) whose larva lives in quinces. -- Quince tree (Bot.), the small tree (Cydonia vulgaris) which produces the quince.

Pertaining to, or designating, a nitrogenous acid obtained as a yellow crystalline substance by the oxidation of quinine.

A yellow crystalline substance produced artificially. It is isomeric with alizarin.

A yellow-flowered weed; -- so named from a Mr. Ramsted who introduced it into Pennsylvania. See Toad flax. Called also Ramsted weed.

A genus of herbs, mostly with yellow flowers, including crowfoot, buttercups, and the cultivated ranunculi (R. Asiaticus, R. aconitifolius, etc.) in which the flowers are double and of various colors.

en it is called the death rattle. See Râle. To spring a rattle, to cause it to sound. -- Yellow rattle (Bot.), a yellow-flowered herb (Rhinanthus Crista- galli), the ripe seeds of which rattle in the inflated calyx.

Any species of Crotalaria, a genus of yellow-flowered herbs, with inflated, many-seeded pods.

road, flat, narrow-tailed species, as the skates and sting rays. See Skate. Bishop ray, a yellow-spotted, long-tailed eagle ray (Stoasodon nàrinari) of the Southern United States and the West Indies. -- Butterfly ray, a short-tailed American sting ray (Pteroplatea Maclura), having very broad pectoral fins. -- Devil r…