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A colorless crystalline substance, C20H22O10, extracted from certain lichens, as the various species of Rocella. It is a derivative of orsellinic acid. So called because of certain red compounds derived from it. Called also erythric acid.

A colorless crystalline substance, C4H6.(OH)4, of a sweet, cooling taste, extracted from certain lichens, and obtained by the decomposition of erythrin; -- called also erythrol, erythroglucin, erythromannite, pseudorcin, cobalt bloom, and under the name phycite obtained from the alga Protococcus vulgaris. It is a tetra…

A dextrin which gives a red color with iodine. See Dextrin.

A term applied by Brücke to a substance present in small amount in starch granules, colored red by iodine.

Of a red color; reddish; as, the erythroid tunic (the cremaster muscle).

Having a red color and oily appearance; -- applied to a purple semifluid substance said to be obtained from archil.

The red coloring matter of leaves, fruits, flowers, etc., in distinction from chlorophyll.

west coast of North America, some species of which produce beautiful yellow, orange, rose-colored, or white flowers; the California poppy.

llied to the perches; -- also called darter. The etheostomoids are small and often bright-colored fishes inhabiting the fresh waters of North America. About seventy species are known. See Darter.

A black substance; -- formerly applied to various preparations of a black or very dark color. [Written also Æthiops.] [Obs.] Ethiops martial (Old Chem.), black oxide of iron. -- Ethiops mineral (Old Chem.), black sulphide of mercury, obtained by triturating mercury with sulphur. -- Ethiops per se (Old Chem.), mercury…

A colorless, mobile, inflammable liquid, C2H5.NH2, very volatile and with an ammoniacal odor. It is a strong base, and is a derivative of ammonia. Called also ethyl carbamine, and amido ethane.

A colorless, gaseous hydrocarbon, C2H4, forming an important ingredient of illuminating gas, and also obtained by the action of concentrated sulphuric acid in alcohol. It is an unsaturated compound and combines directly with chlorine and bromine to form oily liquids (Dutch liquid), -- hence called olefiant gas. Called…

A yellowish coloring matter found in plants grown in darkness, which is supposed to be an antecedent condition of chlorophyll. Encyc. Brit.

Having a fine color. Euchroic acid (Chem.), an organic, imide acid, obtained as a colorless crystalline substance, C12H4N2O8 by heating an ammonium salt of mellitic acid. By reduction it is changed to a dark blue substance (euchrone), -- hence its name.

A mineral of a brownish red color and vitreous luster, consisting chiefly of the silicates of iron, zirconia, and lime.

A colorless, crystalline substance extracted from oil of cloves; -- called also clove camphor.

A colorless, aromatic, liquid hydrocarbon, C10H12O2 resembling the phenols, and hence also called eugenic acid. It is found in the oils of pimento and cloves.

ulphonic (thionic) acid. -- so called because it contains sulphur, and forms brilliantly colored (yellow) salts.

Having a yellow color; pertaining to, derived from, or resembling, euxanthin. Euxanthic acid (Chem.), a yellow, crystalline, organic acid, extracted from euxanthin.

Liable to vanish or disappear; faint; weak; evanescent; as, evanid color. [Obs.] They are very transistory and evanid. Barrow.