pyridine

American  

[pir-i-deen, -din] / ˈpɪr ɪˌdin, -dɪn /

noun

Chemistry.

1. a colorless, flammable, liquid organic base, C 5 H 5 N, 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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pyridine British  

/ ˈpɪrɪˌdiːn /

noun

1. 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

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pyridine Scientific  

/ pĭr′ĭ-dēn′ /

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 Any of a class of organic compounds containing a six-member ring in which one of the carbon atoms has been replaced by a nitrogen atom.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

2. 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: C ₅ H ₅ N.

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Other Word Forms

• pyridic adjective

Etymology

Origin of pyridine

First recorded in 1850–55; pyr- + -id ³ + -ine ²

Example Sentences

They consist of an electron-abundant benzene ring fused to an electron-deficient pyridine ring; these electronically distinct rings can be modified independently by adjusting reaction conditions.

From Science Daily • Jun. 19, 2024

Despite many efforts, most studies have reported photocycloadditions happening on quinoline's benzene ring side, while few have targeted the pyridine side.

From Science Daily • Jun. 19, 2024

Previous research, supported by the fishing industry, had suggested the deaths could have been due to the chemical pyridine, possibly from dredging in the mouth of the River Tees.

From BBC • Feb. 24, 2023

Research last year by academics, backed by the fishing industry, suggested the industrial pollutant pyridine, possibly from dredging at the mouth of the River Tees, as a potential cause.

From Seattle Times • Jan. 20, 2023

Bertrand, G. and Weisweiller, G. Sur la composition de l'essence de café; présence de la pyridine.

From All About Coffee by Ukers, William H. (William Harrison)