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Pertaining to, or derived from, the ivy (Hedera); as, hederic acid, an acid of the acetylene series.

An albuminous substance formed in gastric digestion, and by the action of boiling dilute acids on albumin. It is readily convertible into hemipeptone. Called also hemialbumin.

Having half as many (three) carboxyl radicals as mellitic acid; -- said of an organic acid.

, microscopic, prismatic crystals, formed from dried blood by the action of strong acetic acid and common salt; -- called also Teichmann's crystals. Chemically, it is a hydrochloride of hematin.

ibed by Schützenberger, formed when albumin is heated for some time with dilute sulphuric acid. It is apparently identical with antialbumid and dyspeptone.

Undecylic; pertaining to, or derived from, hendecane; as, hendecatoic acid.

resinous substance resembling tannin, and extracted from the henna plant; as, hennotannic acid.

tuted for, or replaced by, seven monad atoms or radicals; as, iodine is a heptad in iodic acid. Also used as an adjective.

Pertaining to, or derived from, heptane; as, heptoic acid.

les of the hermetic philosophy, and which made much use, as a remedy, of an alkali and an acid; as, hermetic medicine.

ained by the decomposition of hesperidin, and regarded as a complex derivative of caffeic acid.

ogous members of different series; as, ethane, ethyl alcohol, acetic aldehyde, and acetic acid are in heterology with each other, though each in at the same time a member of a distinct homologous series. Cf. Homology.

ydrogen atoms or six radicals capable of being replaced or saturated by bases; -- said of acids; as, mellitic acid is hexabasic.

ted for, or replaced by, six monad atoms or radicals; as, sulphur is a hexad in sulphuric acid. Also used as an adjective.

Pertaining to, or derived from, hexane; as, hexoic acid.

Obtained from the urine of horses; as, hippuric acid. Hippuric acid, a white crystalline substance, containing nitrogen, present in the urine of herbivorous animals, and in small quantity in human urine. By the action of acids, it is decomposed into benzoic acid and glycocoll.

Of, pertaining to, or derived from, mutton suet; -- applied by Chevreul to an oily acid which was obtained from mutton suet, and to which he attributed the peculiar taste and smell of that substance. The substance has also been called hircin. Watts.

Hircic acid. See Hircic. [R.]

ition (, that form of nutrition, characteristic of vegetable organisms, in which carbonic acid, ammonia, and nitrates are absorbed as food, in distinction from the animal mode of nutrition, by the ingestion of albuminous matter.

Pertaining to, or derived from, barley; as, hordeic acid, an acid identical or isomeric with lauric acid.