Mid 19th century; earliest use found in The Chemical Gazette. From French carbostyrile from carbo- + -styril (in styriline a base analogous to aniline: 1852 in the article cited above; from styr- (in styrole) + -iline (in aniline)). (Source: lexico.com)
Definitions of Carbostyril
A crystalline compound produced by the oxidation of quinoline; any of the substituted derivatives of this compound, some of which have pharmacological activity.