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