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The Collaborative International Dictionary
Quinaldine

Quinaldine \Quin*al"dine\, n. [Quinoline + aldehyde + aniline.] (Chem.) A colorless liquid of a slightly pungent odor, C9H6N.CH3, first obtained as a condensation product of aldehyde and aniline, and regarded as a derivative of quinoline; -- called also methyl quinoline. [Written also chinaldine.]

Wiktionary
quinaldine

alt. (context organic compound English) An oily liquid, ''α-methylquinoline'', derived from coal tar, used in the manufacture of pharmaceuticals and as a sedative for fish. n. (context organic compound English) An oily liquid, ''α-methylquinoline'', derived from coal tar, used in the manufacture of pharmaceuticals and as a sedative for fish.

Wikipedia
Quinaldine

Quinaldine or 2-methylquinoline is an organic compound with the formula CHCHN. It is one of the methyl derivative of a heterocyclic compound quinoline. It is bioactive and is used in the preparation of various dyes. It is a colorless oil but commercial samples can be colored.