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The Collaborative International Dictionary
Dipyridyl

Dipyridyl \Di*pyr"i*dyl\, n. [Pref. di- + pyridine + -yl.] (Chem.) A crystalline nitrogenous base, C10H8N2, obtained by the reduction of pyridine.

Wiktionary
dipyridyl

n. (context organic compound English) bipyridyl