Defn: An uncrystallizable alkaloid obtained by the action of heat from quinine, with which it is isomeric.
QUINIDINE
Quin"i*dine, n. (Chem.)
Defn: An alkaloid isomeric with, and resembling, quinine, found in certain species of cinchona, from which it is extracted as a bitter white crystalline substance; conchinine. It is used somewhat as a febrifuge. [Written also chinidine.]
QUININE
Qui"nine, n. Etym: [F. (cf. Sp. quinina), fr. Sp. quina, or
quinaquina, Peruvian bark, fr. Peruv. kina, quina, bark. Cf. Kinic.]
(Chem.)
Defn: An alkaloid extracted from the bark of several species of cinchona (esp. Cinchona Calisaya) as a bitter white crystalline substance, C20H24N2O2. Hence, by extension (Med.), any of the salts of this alkaloid, as the acetate, chloride, sulphate, etc., employed as a febrifuge or antiperiodic. Called also quinia, quinina, etc. [Written also chinine.]
QUININIC
Qui*nin"ic, a. (Chem.)
Defn: Pertaining to, or designating, a nitrogenous acid obtained as a yellow crystalline substance by the oxidation of quinine.
QUININISM; QUINISM
Qui"nin*ism, Qui"nism, n. (Med.)
Defn: See Cinchonism.
QUINIZARIN
Qui*niz"a*rin, Etym: [Hydroquinone + alizarin.] (Chem.)