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ciation of the sulphur molecules; the dissociation of ammonium chloride into hydrochloric acid and ammonia.

as, the distillation of illuminating gas and coal, of alcohol from sour mash, or of boric acid in steam.

A salt of disulphuric or pyrosulphuric acid; a pyrosulphate.

Applied to an acid having in each molecule two atoms of sulphur in the higher state of oxidation. Disulphuric acid, a thick oily liquid, H2S2O7, called also Nordhausen acid (from Nordhausen in the Harts, where it was originally manufactured), fuming sulphuric acid, and especially pyrosulphuric acid. See under Pyrosulph…

Containing two equivalents of sulphur; as, dithionic acid. Dithionic acid (Chem.), an unstable substance, H2S2O6, known only in its solutions, and in certain well-defined salts.

genous substances regarded as containing two molecules of urea or their radicals, as uric acid or allantoin. Cf. Ureide.

rica (Cæsalpinia coriaria), whose legumes contain a large proportion of tannic and gallic acid, and are used by tanners and dyers.

An aqueous solution of carbolic acid, borax, sodium bicarbonate, and glycerin, used as a spray in diseases of the nose and throat.

Pertaining to, or obtained from, the doegling; as, doeglic acid (Chem.), an oily substance resembling oleic acid.

action. (Opt.) See Refraction. -- Double salt. (Chem.) (a) A mixed salt of any polybasic acid which has been saturated by different bases or basic radicals, as the double carbonate of sodium and potassium, NaKCO3.6H2O. (b) A molecular combination of two distinct salts, as common alum, which consists of the sulphate of…

Made of, or resembling, down. Hence, figuratively: Soft; placid; soothing; quiet. "A downy shower." Keble. "Downy pillow." Pope. Time steals on with downy feet. Young.

he burin, in which the work is done nearly as in etching, but is finished without the use acid. (b) A print from such an engraving, usually upon paper. (c) Hence: The needle with which such an engraving is made. -- Dry rent (Eng. Law), a rent reserved by deed, without a clause of distress. Bouvier. -- Dry rot, a deca…

Sweetened; mollified. Dulcified spirit or spirits, a compound of alcohol with mineral acids; as, dulcified spirits of niter.

To sweeten; to free from acidity, saltness, or acrimony. Wiseman.

Pertaining to, allied to, or derived from, durene; as, durylic acid.

A resinous substance formed in the decomposition of cholic acid of bile; -- so called because it is difficult to solve.

Sharp; sour; acid. [Obs.] "Like eager droppings into milk." Shak.

rocess which causes the liberation of a gas or an aëriform fluid, as in the mixture of an acid with a carbonated alkali. [Formerly written bullition.]

he teeth on edge, to cause a disagreeable tingling sensation in the teeth, as by bringing acids into contact with them. Bacon.

Having a tendency to purify or to sweeten by removing or correcting acidity and acrimony.