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One of a large series of amorphous or crystalline substances, occurring very widely distributed in plants, rarely in animals, and regarded as influental agents in the formation and disposition of the sugars. They are frequently of a bitter taste, but, by the action of ferments, or of dilute acids and alkalies, always b…

A glucoside extracted from bitter almonds as a white, crystalline substance.

coffee. Caffetannic acid, a variety of tannin obtained from coffee berries, regarded as a glucoside.

ential coloring principle of cochineal, extracted as a purple-red amorphous mass. It is a glucoside and possesses acid properties; -- hence called also carminic acid. Carmine red (Chem.), a coloring matter obtained from carmine as a purple-red substance, and probably allied to the phthaleïns.

The bitter, purgative principle of senna. It is a glucoside with the properties of a weak acid; -- called also cathartic acid, and cathartina.

A glucoside extracted from rhubarb as a bitter, yellow, crystalline powder, and yielding chrysophanic acid on decomposition.

medicinal principle of colocynth; a bitter, yellow, crystalline substance, regarded as a glucoside.

A glucoside extracted from the cambium layer of coniferous trees as a white crystalline substance.

A white, crystalline, poisonous substance, regarded as a glucoside, extracted from the lily of the valley (Convallaria Majalis). Its taste is first bitter, then sweet.

A white, crystalline glucoside, of an irritating taste, extracted from the convallaria or lily of the valley.

A glucoside occurring in jalap (the root of a convolvulaceous plant), and extracted as a colorless, tasteless, gummy mass of powerful purgative properties.

A white amorphous substance, regarded as a glucoside, extracted from the corm of Cyclamen Europæum.

A white, crystalline, bitter substance, regarded as a glucoside, and extracted from Daphne mezereum and D. alpina.

A white crystalline glucoside extracted from the bastard hemp (Datisca cannabina).

A glucoside extracted from the bittersweet (Solanum Dulcamara), as a yellow amorphous substance. It probably occasions the compound taste. See Bittersweet, 3(a).

n this extract and in other vegetable juices), which effects the decomposition of certain glucosides.

A glucoside found in the bearberry (and others of the Ericaceæ), and extracted as a bitter, yellow, amorphous mass.

A glucoside obtained from the Æsculus hippocastanum, or horse- chestnut, and characterized by its fine blue fluorescent solutions. [Written also æsculin.]

A yellow crystalline dyestuff, regarded as a glucoside, extracted from a species (Rhamnus Frangula) of the buckthorn; -- called also rhamnoxanthin.

A colorless crystalline substance, regarded as a glucoside, and found in the bark of the ash (Fraxinus) and along with esculin in the bark of the horse-chestnut. It shows a delicate fluorescence in alkaline solutions; -- called also paviin.