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3. pyridyl

The Collaborative International Dictionary

Pyridyl

Pyridyl \Pyr"i*dyl\, n. [Pyridine + -yl.] (Chem.) A hypothetical radical, C5H4N, regarded as the essential residue of pyridine, and analogous to phenyl.

Wiktionary

pyridyl

n. (context chemistry English) Any of three isomeric univalent radicals, C₅H₄N-, derived from pyridine; analogous to phenyl.