A bitter compound isolated from the wood of Quassia amara and Picrasma excelsa (see quassia, n. 1), with insecticidal, antipyretic, and other…

The bitter principle of colocynth, resembling a semi-transparent resin, and readily soluble in alcohol.

A bitter, yellow, crystalline compound, present in the roots of plants of the genus Plumbago; 5-hydroxy-2-methyl-1,4-naphthoquinone, C11H8O3.

= colocynthin, n.

= quassin, n.

A name proposed for various bitter vegetable principles; spec. applied to the alkaloid (C21H18N2) resulting from the action of ammonia on essence of…

A yellow colouring matter obtained from the berries of common or purging buckthorn, Rhamnus cathartica, containing flavonoid glycosides; (also) = rham…

A bitter substance obtained from the leaves of the matico plant.

(See quot.) Also (rare) limone.

A bitter substance obtained from serpentary root.

A brownish-yellow resinous substance isolated from madder root, subsequently shown to consist of a mixture of glycosides of alizarin and other…

The bitter aromatic principle of the hop; lupulin.

A bitter glucoside, C22H36O11, obtained from the needles and bark of the Scots pine, Pinus sylvestris, and the leaves of the American arbor vitae, Th…

the non-nitrogenous bitter principle of the holly.

A red carotenoid pigment, C72H116O4, that is the bitter principle of the Chinese lantern plant, Physalis alkekengi; zeaxanthin dipalmitate. Also: any…

A bitter substance obtained from Scrophularia nodosa (knotted figwort).

An acrid principle found in the leaves of Lobelia inflata.

a yellow bitter principle, obtained from the barberry and other plants.

Chemistry and Medicine. Usually citrullin. A resinous substance extracted from the rind of the colocynth or bitter apple, Citrullus colocynthis…

(see quot. 1900).