- a colorless, flammable, liquid organic base, C5H5N, having a disagreeable odor, usually obtained from coal or synthesized from acetaldehyde and ammonia: used chiefly as a solvent and in organic synthesis.
Origin of pyridine
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Examples from the Web for pyridine
Pyridine was, however, found in the smoke of all tobacco burned.Tobacco Leaves
W. A. Brennan
Indeed, Ladenberg has recently succeeded in obtaining benzol as an alteration product from pyridine, in certain reactions.
When cinchonine is distilled with solid potassium hydrate, it yields pyrrol and bases of both the pyridine and quinoline series.
This latter base has been shown to be a hydrogen addition product of pyridine, C5H5N.
When heated with concentrated sulphuric acid, it is oxidized to pyridine.
- a colourless hygroscopic liquid with a characteristic odour. It is a basic heterocyclic compound containing one nitrogen atom and five carbon atoms in its molecules and is used as a solvent and in preparing other organic chemicals. Formula: C 5 H 5 N
C19: from pyro- + -id ³ + -ine ²
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
- A flammable, colorless or yellowish liquid base that results from the dry distillation of organic matter containing nitrogen, has a penetrating odor, and is used in analytical chemistry and in the manufacture of various drugs and vitamins.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- Any of a class of organic compounds containing a six-member ring in which one of the carbon atoms has been replaced by a nitrogen atom. Pyridines include compounds used as water repellents, herbicides, and various drugs. The pyridine ring structure is also part of many larger compounds, including niacin and nicotine.
- The simplest of these compounds, a flammable, colorless or yellowish liquid base having a penetrating odor. It is used as a solvent and waterproofing agent and in the manufacture of various drugs and vitamins. Chemical formula: C5H5N.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.