= mellitic acid n. at mellitic, adj.

Chemistry melanic acid n. A constituent of urine which darkens on oxidation, perhaps potassium indoxylsulphate (‘indican of urine’). Cf. melanurin, n.…

a very unstable acid, liable to polymerize rapidly and known chiefly in the form of highly explosive salts with metals; cf. fulminate, n.

an acid produced by the action of sulphuric acid on alcohol or spirit of wine; ethyl hydrogen sulphate or ethyl sulphuric acid.

Chemistry. Epithet of certain compounds which produce substances of a yellow colour, or of bodies… xanthic acid, a complex acid containing sulphur…

= sulphovinic acid n. at sulphovinic, adj. Cf. althionic acid n. at althionic, adj.

= sulphovinic acid n. at sulphovinic, adj. Cf. alcoothionic acid n. at alcoothionic, adj.

Chemistry naphthalic acid n. = phthalic acid n. at phthalic, adj. 1b. Now historical.

A colourless substance obtained by boiling murexide with hydrochloric acid, now identified with uramil.

oxalhydric acid n.= saccharic acid at saccharic, adj. 1.

a crystalline, saturated, straight-chain fatty acid isolated from oxidized fats and used in biochemical research and in the plastic industry…

a yellowish, liquid organic acid which was first obtained by distilling tartaric acid and is an intermediate in many metabolic processes, esp…

in thionuric acid, CO:2(NH.CO):CH.NH.SO3H, formed by the action of ammonia and sulphurous acid on alloxan in aqueous solution.

In glucic acid, an acid obtained by the action of alkalis or acids on glucose.

(a) = myristic acid n. at myristic, adj. 2; (b) an acid of uncertain identity obtained by the chemical treatment of silk (now rare or disused).

a solid acid obtained by the breakdown of indigo and used as a starting material for the synthesis of dyes and other compounds.

a pungent liquid carboxylic acid which can be polymerized to form fibres, plastics, and coatings.

A dark-brown or black product resulting from the decay of wood or vegetable matter, or artificially obtained by the action of powerful chemical…

a red colouring matter found in the petals of the corn poppy, Papaver rhoeas; cf. rhoeadine, n. 1.

phthalic acid, as produced by the action of nitric acid on alizarin or rubian.

in thiacetic acid (C2H3O.SH), a colourless liquid boiling at 93°C.

any of a number of acidic compounds which are trimers of fulminic acid; esp. nitrocyanoacetamide, an unstable crystalline compound.

(a) a solid dicarboxylic acid, C6H4(COOH)2, originally produced by the oxidation of naphthalene with nitric acid or aqua regia…

a dicarboxylic acid found in wheat, barley and rye, used as a reagent in chemical synthesis and as a component of creams and gels used to treat…

Of or pertaining to graphite; having the nature of graphite. graphitic acid (see quot. 1864).

a crystalline acid formed with tropine by hydrolysis of atropine.

Of, pertaining to, or derived from thymol. thymotic acid, C11H14O3, a white, loosely coherent, crystalline solid, having a silky lustre, prepared…

any of several saturated fatty acids having the formula C7H15COOH; = octanoic acid n. at octanoic, adj.; spec. (also n-octoic acid) n-octanoic acid.

= nucleic acid n. at nucleic, adj. 1.

any oxyacid of pentavalent phosphorus which contains two or more phosphorus atoms in the anion; esp. a mixture of polymers of orthophosphoric…

a crystalline alicyclic acid, C5H7·(CH2)10·COOH, which in the form of its glycerides is one of the chief constituents of chaulmoogra oil and…

the uronic acid derived from glucose; cf. glycuronic, adj.

any saturated fatty acid of the formula C7H15COOH, of which several isomers exist; spec. (also n-octanoic acid) the straight-chain primary acid…

the parent acid of Reinecke's salt, which can also be isolated as red crystals.

= acrylic acid n. at acrylic, adj. n.compounds.

a carboxylic acid, S—S—CH2CH2CH(CH2)4COOH, found in yeast and liver extracts which is a cofactor in the decarboxylation of pyruvate in vivo.

A derivative of picolinic acid used as a herbicide and defoliant against deep-rooted weeds and woody plants; 4-amino-3,5,6-trichloropicolinic…

the organic acid of which wyerone is the methyl ester, and which has similar properties.