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Pertaining to, or derived from, ergot; as, ergotic acid.

derived from, a genus of cruciferous Mediterranean herbs (Eruca or Brassica); as, erucic acid, a fatty acid resembling oleic acid, and found in colza oil, mustard oil, etc.

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 substance reddened by acids, which is supposed to be contained in flowers.

A name originally given (from its red acid) to the metal vanadium. [R.]

Pertaining to, or obtained from, the horse-chestnut; as, esculic acid.

or compound ether, consisting of an organic radical united with the residue of any oxygen acid, organic or inorganic; thus the natural fats are esters of glycerin and the fatty acids, oleic, etc.

s, or the like, by means of lines or strokes eaten in or corroded by means of some strong acid.

The act, art, or practice of engraving by means of acid which eats away lines or surfaces left unprotected in metal, glass, or the like. See Etch, v. t.

eries, and its most important derivatives are common alcohol, aldehyde, ether, and acetic acid. Called also dimethyl.

of a characteristic aromatic odor, obtained by the distillation of alcohol with sulphuric acid, and hence called also sulphuric ether. It is powerful solvent of fats, resins, and pyroxylin, but finds its chief use as an anæsthetic. Called also ethyl oxide.ethyl ether.

transformed into ether by the agency of a small amount of sulphuric, or ethyl sulphuric, acid.

Pertaining to, derived from, or designating, an acid so called. Ethionic acid (Chem.), a liquid derivative of ethylsulphuric and sulphuric (thionic) acids, obtained by the action of sulphur trioxide on absolute alcohol.

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 also ethene, elayl, and formerly, bicarbureted hydrogen. Ethy…

Pertaining to, or containing, ethyl and sulphuric acid. Ethylsulphuric acid (Chem.), an acid sulphate of ethyl, H.C2H5.SO4, produced as a thick liquid by the action of sulphiric acid on alcohol. It appears to be the active catalytic agent in the process of etherification.

nish yellow gas, first prepared by Davy, evolved from potassium chlorate and hydrochloric acid. It is supposed to consist of chlorine tetroxide with some free chlorine.

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 substance obtained from euchroic acid. See Eychroic.

Pertaining to, or derived from, cloves; as, eugenic acid.

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