pyridine noun. ['pɪrɪdi:n] M19.
[from Greek pur fire + -IDINE.]
Chemistry. A colourless volatile liquid with a pungent odour present in coal tar, whose molecule is an unsaturated heterocycle of formula C₅H₅N.

Comb.:
pyridine nucleotide Biochemistry either of the two oxidizing coenzymes NAD and NADP (nicotinamide adenine dinucleotide and its phosphate).

■ pyridyl noun the radical C₅H₄N E20.

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