[kwin-l-een, -in]

noun Chemistry.

a colorless, liquid, water-immiscible, nitrogenous base, C9H7N, having a disagreeable odor, occurring in coal tar, and usually prepared by oxidizing a mixture of glycerol and aniline: used as a solvent and reagent and to make dyes.

Nearby words

  1. quinoa,
  2. quinoid,
  3. quinoidal,
  4. quinoidine,
  5. quinol,
  6. quinolone,
  7. quinone,
  8. quinone diimine,
  9. quinonimine,
  10. quinonoid

Origin of quinoline

First recorded in 1835–45; quin(ine) + -ol1 + -ine2

Also called leucoline.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for quinoline

British Dictionary definitions for quinoline



an oily colourless insoluble basic heterocyclic compound synthesized by heating aniline, nitrobenzene, glycerol, and sulphuric acid: used as a food preservative and in the manufacture of dyes and antiseptics. Formula: C 9 H 7 N
any substituted derivative of quinoline
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for quinoline


[kwĭnə-lēn′, -lĭn]


An aromatic organic base synthesized or obtained from coal tar and used as a food preservative and in making antiseptics.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for quinoline


[kwĭnə-lēn′, -lĭn]

An aromatic organic liquid having a pungent, tarlike odor. Quinoline is a base and is obtained from coal tar or is synthesized. It is used as a food preservative and in making antiseptics and dyes. Chemical formula: C9H7N.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.