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pyridine

[pir-i-deen, -din]

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noun Chemistry.

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.

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Origin:
1850–55; pyr- + -id³ + -ine²

Related forms

py·rid·ic

[pahy-rid-ik] , adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Pyridine is always a great word to know.

So is cyanide. Does it mean:

a compound capable of changing state or becoming inactive when subjected to heat or radiation

a salt of hydrocyanic acid, such as potassium cyanide, KCN

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Collins

World English Dictionary

pyridine (ˈpɪrɪˌdiːn)

—n
	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: C₅H₅N

[C19: from pyro- + -id³ + -ine²]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Medical Dictionary

pyridine pyr·i·dine (pĭr'ĭ-dēn')
n.
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.

py·rid'ic (pī-rĭd'ĭk) adj.

American Heritage

Science Dictionary

pyridine

(pĭr'ĭ-dēn') Pronunciation Key

Any of a class of organic compounds containing a six-member ring in which one of the carbon atoms has been replaced by a nitrogen atom.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.

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phenazopyridine picoline

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