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ained as a brownish red substance, which is used as a dye; -- so called from the peculiar yellowish green fluorescence (resembling that of uranium glass) of its solutions. See Fluorescein.

ite, etc., and reduced as a heavy, hard, nickel-white metal which is quite permanent. Its yellow oxide is used to impart to glass a delicate greenish-yellow tint which is accompanied by a strong fluorescence, and its black oxide is used as a pigment in porcelain painting. Symbol U. Atomic weight 239.…

uric acid is frequently deposited, on standing in a cool place, in the form of a reddish yellow sediment, nearly always crystalline. Chemically, it is composed of carbon, hydrogen, nitrogen, and oxygen, C5H4N4O3, and by decomposition yields urea, among other products. It can be made synthetically by heating together u…

A yellow pigment identical with hydrobilirubin, abundant in the highly colored urine of fever, and also present in normal urine. See Urochrome.

A yellow urinary pigment, considered by Thudichum as the only pigment present in normal urine. It is regarded by Maly as identical with urobilin.

Pertaining to, or designating, a complex acid obtained, as a yellow crystalline substance, from certain genera of lichens (Usnea, Parmelia, etc.).

A mineral occurring in yellowish, and ruby-red hexagonal crystals. It consist of lead vanadate with a small proportion of lead chloride.

A yellow pigment consisting of a compound of vanadium.

annelids the fluid which they contain is usually red, but in some it is green, in others yellow, or whitish.

A yellowish translucent substance, almost odorless and tasteless, obtained as a residue in the purification of crude petroleum, and consisting essentially of a mixture of several of the higher members of the paraffin series. It is used as an unguent, and for various purposes in the arts. See the Note under Petrolatum.…

er Soap. -- Venetian sumac (Bot.), a South European tree (Rhus Cotinus) which yields the yellow dyewood called fustet; -- also called smoke tree. -- Venetian window (Arch.), a window consisting of a main window with an arched head, having on each side a long and narrow window with a square head.

gonia flabellum) native of Florida and the West Indies. When fresh the color is purple or yellow, or a mixture of the two. -- Venus's flytrap. (Bot.) See Flytrap, 2. -- Venus's girdle (Zoöl.), a long, flat, ribbonlike, very delicate, transparent and iridescent ctenophore (Cestum Veneris) which swims in the open sea.…

A yellowish amorphous alkaloid extracted from the rootstock of Veratrum album.

A small yellow-headed bird (Auriparus flaviceps) of Lower California, allied to the titmice; -- called also goldtit.

An alkaloid obtained as a yellow amorphous substance by the decomposition of veratrine.

lic element of which little is known. It is said by Scacchi to have been extracted from a yellowish incrustation from the cracks of a Vesuvian lava erupted in 1631.

rring in tetragonal crystals, and also massive, of a brown to green color, rarely sulphur yellow and blue. It is a silicate of alumina and lime with some iron magnesia, and is common at Vesuvius. Also called idocrase.

white swallowwort (Vincetoxicum officinale, a plant of the Asclepias family) as a bitter yellow amorphous substance; -- called also asclepiadin, and cynanchin.

A complex nitrogenous substance, produced as a yellow crystalline substance, and regarded as a complex derivative of barbituric acid.

A yellow crystalline glucoside obtained from the pansy (Viola tricolor), and decomposing into glucose and quercitrin.