†(a) (J. Henderson's name for) an acid occurring in the stem of garden rhubarb, later identified with oxalic acid (obsolete); (b) an acid derived…

†(a) (perhaps) = gummic acid n. at gummic, adj. (obsolete rare); (b) = arabinic acid n. at arabinic, adj.

†(a) a colourless acid (not identified) obtained by Runge from madder (obsolete); (b) a lemon-yellow acid (not identified) prepared by Schunck…

Of or pertaining to asparagine; esp. in aspartic acid, C4H7NO4, produced by the action of alkalis or acids on asparagine. ˈaspartate n. a…

a colourless crystalline substance, isomeric with pinic acid, and, like it, forming a constituent of colophony or turpentine-resin.

a name introduced in 1834 by Pelouze instead of tannin, n., in recognition of its acid character and reactions; originally applied to the tannin…

†(a) an acid obtained from oenanthic ether and later shown to be a mixture consisting chiefly of straight-chain fatty acids including caprylic…

an acid obtained from gum = arabic acid n. at arabic, adj.2

an acidic substance of uncertain identity (probably a mixture of terpenoids) extracted from retinite (fossil resin) using alcohol.

a crystalline carboxylic acid related to succinic acid, and found in certain lichens of genera that include Roccella and Lecanora.

a tannic acid (not further identified) produced by the action of alkali on catechin.

an acid existing in Lobelia inflata.

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

an acid isolated from rhubarb, later identified with chrysophanic acid.

= roccellic acid n. at roccellic, adj. 1. Also: = roccellinin, n. Obsolete.

Of or pertaining to humus or mould; present in or of the nature of humus; rich in humus; also, formed or derived from plant remains.

a carboxylic acid found in the root of the sumbul plant, Ferula moschata; = sumbulic acid n. at sumbulic, adj.

C8H7NO3 (= isatin + H2O), substitution products of which are bromisatic acid (C8H6BrNO3), chlorisatic acid, etc.; the salts are isatates/ˈaɪsəteɪts/…

a crystalline aldehydic aromatic acid obtained from the oxidation of narcotine; 6-formyl-2,3-dimethoxybenzoic acid, C10H10O5.

parthenic acid n. An acid reported as formed by the oxidation of the liquid produced by distilling camomile flowers.

= aloetic acid n. at aloetic, adj. 2.

a dibasic astringent acid obtained by the action of nitric acid on asafœtida and other gum resins. Also called oxypicric acid.

an uncrystallizable acid formed from pectic acid after boiling and treating with alkali; (perhaps) = arabic acid n. at arabic, adj.2

in tanningenic acid, a synonym of catechuic, adj. acid and catechin, n.

jalapic acid: C68H59O35, an acid produced by dissolving jalapin in aqueous solutions of the alkalis or alkaline earths.

the dextrorotatory form of 11-hydroxyhexadecanoic acid, CH3(CH2)4CHOH(CH2)9COOH, a crystalline derivative of palmitic acid obtained by hydrolysis…

Of, pertaining to, or derived from sinapine.

In amalic acid: C4(CH3)4N4O7 + H2O, a product of the decomposition of caffeine by chlorine; so named from its feeble acid reaction.

a colourless, crystalline organic acid of uncertain composition extracted from the green alga Pleurococcus viridis.

Pertaining to or derived from ferns. filicic acid: a mixture of phloroglucinol derivatives obtained from the rhizome of various ferns (chiefly the…

Related to isatin and to ammonia; in isamic acid, C16H13N3O4, produced by the action of warm ammonia on isatin. Its salts are ˈisamates n.

tannocaˈffeic acid n. = caffetannic acid n. at caffeic, adj. derivatives.

a crystalline tribasic acid found in immature beets and produced synthetically; propane-1,2,3-tricarboxylic acid, HOOC·CH(CH2COOH)2.

a white compound, C20H24O4, found in gum guaiacum.

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

= rutin, n.

a yellow crystalline acid, reported to have the formula C10H4N2O7, obtained by the reaction of nitric acid on euxanthone, and producing a blood-red…

in thujetic acid.

in turpetholic acid, C16H32O4, a derivative of turpethin, crystallizing in a mass of slender microscopic needles having an irritant taste.

(see quot. 1868).

a tannin found in rhubarb.

an acidic polysaccharide containing arabinose units and which is obtained from gum arabic, in which it is present as salts; cf. arabin, n.

one of the two most active constituents of ergot.

in theobromic acid (see quots.).

gynocardic acid: the supposed active principle of Chaulmugra oil, which is produced by the plant Gynocardia odorata.

an acid found in chaulmoogra oil.