C20H27NO11 + 3H2O; a peculiar substance found crystalline in the kernels of almonds and other stone fruit, and amorphous in the leaves of the…

A nitrogenized crystallizable compound contained in asparagus, and many other vegetables. It is primary malic diamide C4H4O3(NH2)2.

A crystalline terpenoid compound which is the main constituent of ambergris.

Any of several organic compounds isolated from the sap of aloes; (in later use) spec. an anthraquinone which forms bitter-tasting lemon-yellow…

A colourless compound obtained from the lichen orchil, from which orcein is made; = orcinol, n. Cf. orcein, n.

An acrid crystalline substance which occurs in various plants of the genera Anemone and Ranunculus (family Ranunculaceae) and is a dimer of the…

A crystalline principle contained in guarana, and regarded by some as identical with caffeine.

A colourless crystalline substance (C6H8O) obtained from the root of elecampane (Inula helenium).

a brown, crystalline, nitrogen-containing substance found in ochre deposits in wells (not further identified).

A crystalline substance obtained from storax and balsam of Peru.

a crystalline acid formed by the partial hydrolysis of alloxan.

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

(See quots.)

A crystalline substance obtained from the lilac, Syringa vulgaris; now called syringin, n.

A white crystalline substance, C17H24O9, obtained from the lilac, Syringa vulgaris.

any of a group of related acids obtained from orchil and other lichens; spec. = orsellinic acid n. at orsellinic, adj. 1.

A crystalline substance (not identified) obtained from the lichen Roccella tinctoria.

A yellow crystalline compound which occurs in various plants, esp. the common or purging buckthorn, Rhamnus cathartica.

A crystalline compound obtained ‘by treating saponin with dilute mineral acids’. In modern use, a generic term for any of the steroid aglycones of…

(See quot.)

A substance extracted from the green alga Pleurococcus viridis, later identified as erythritol.

A yellow crystalline compound, C15H10O6, formerly obtained from young fustic (Rhus cotinus) and various other trees for use as a dye.

= juglone, n.

a yellow crystalline quinone; 2,5-dimethyl-p-benzoquinone, (CH3)2C6H2O2.

A crystalline bicyclic aldehyde obtained synthetically and from certain flowers and used in perfumery and flavourings…

A crystalline substance obtained by distilling parsley seeds with water; parsley-camphor. (Watts Dict. Chem. VIII. 118.)

A fæcal extractive resembling biliary cholesterin.

5-Hydroxy-1,4-naphthoquinone, C10H6O3, a reddish-yellow crystalline compound obtained from the green shells of walnuts and having fungicidal…

A colourless crystalline phenol which is obtained from orchil and other lichens, turns red on exposure to air, and is used as a reagent for pentose…

a crystalline substance (C14H12O6) obtained from East Indian kino.

A crystalline principle obtained esp. from the leaves of the bearberry.

Chemistry. 5, 7, 3′-Trihydroxy-6, 4′, 5′-trimethoxyisoflavone 7-glucoside, C24H26O13, a crystalline compound occurring in the rhizome…

A white or pale yellow crystalline flavonoid diglycoside, 2C27H30O15, first found in soapwort, Saponaria officinalis.

A colourless crystalline glycoside of the nitrile of d-mandelic acid, found in the leaves of the elder and having the formula C6H5·CH(CN)·O·C6H11O5.

Chemistry and Mineralogy. One of the ultimate units of matter in a crystalline material. Cf. leptonology, n. Now disused.

a nitrogenous material found in injured tissue and inflammatory exudates which on injection causes inflammation, increase in the permeability of…

A crystalline, toxic (cyanogenic) compound present in Austral trefoil (Lotus australis), white clover, cassava, and some other plants.

Chemistry. A crystalline substance in which only ions are present in the crystal lattice.