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A white crystalline substance, C27H55.OH, obtained from Chinese wax, and regarded as an alcohol of the marsh gas series; -- called also cerotic alcohol, ceryl alcohol.

Islandica). It consists of several ingredients, among which is cetraric acid, a white, crystalline, bitter substance.

f, pertaining to, or derived from, spermaceti. Cetylic alcohol (Chem.), a white, waxy, crystalline solid, obtained from spermaceti, and regarded as homologous with ordinary, or ethyl, alcohol; ethal; - - called also cetyl alcohol.

A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax. [Written also calcedony.]

ained from the celandine, and named from the red color of its salts, It is a coloriess crystalline substance, and acts as an acrid narcotic poison. It is identical with sanguinarine.

eidonic acid, a weak acid extracted fron the celandine (Chelidonium majus), as a white crystalline substance.

The mineral azurite, found in fine crystallization at Chessy, near Lyons; called also chessylite.

To produce, by sudden cooling, a change of crystallization at or near the surface of, so as to increase the hardness; said of cast iron.

Chloral hydrate. Chloral hydrate, a white crystalline substance, obtained by treating chloral with water. It produces sleep when taken internally or hypodermically; -- called also chloral.

A yellow crystalline substance, C6Cl4.O2, regarded as a derivative of quinone, obtained by the action of chlorine on certain benzene derivatives, as aniline.

A white, fatty, crystalline substance, tasteless and odorless, found in animal and plant products and tissue, and especially in nerve tissue, in the bile, and in gallstones.

te of magnesia and iron, yellow to red in color, often occurring in granular form in a crystalline limestone.

Chrome alum (Chem.), a dark violet substance, (SO4)3Cr2.K2SO4.24H2O, analogous to, and crystallizing like, common alum. It is regarded as a double sulphate of chromium and potassium. -- Chrome green (a) The green oxide of chromium, Cr2O3, used in enamel painting, and glass staining. (b) A pigment made by mixing chrome…

ed pigments, as chrome yellow, chrome red, etc. -- Chromic anhydride, a brilliant red crystalline substance, CrO3, regarded as the anhydride of chromic acid. It is one of the most powerful oxidizers known.

aromatic hydrocarbons of coal tar, allied to napthalene and anthracene. It is a white crystalline substance, C18H12, of strong blue fluorescence, but generally colored yellow by impurities.

A yellow crystalline substance extracted from crude anthracene.

An artificial, yellow, crystalline dye, C6H5N2.C6H3(NH2)2. Also, one of a group of dyestuffs resembling chrysoïdine proper.

A glucoside extracted from rhubarb as a bitter, yellow, crystalline powder, and yielding chrysophanic acid on decomposition.

g to, or derived from, or resembling, chrysophane. Chrysophanic acid (Chem.), a yellow crystalline substance extracted from rhubarb, yellow dock, sienna, chrysarobin, etc., and shown to be a derivative of an anthracene. It is used in the treatment of skin diseases; -- called also rhein, rheic acid, rhubarbarin, etc.…

f the quinine group of alkaloids, found especially in red cinchona bark. It is a white crystalline substance, C19H22N2O, with a bitter taste and qualities similar to, but weaker than, quinine; -- sometimes called also cinchonidia.