n. [ Pyridine + -yl. ] (Chem.) A hypothetical radical,
n. [ Pref. di- + pyridine + -yl. ] (Chem.) A crystalline nitrogenous base,
n. [ Pref. di- + pyridine + -yl. ] (Chem.) A crystalline nitrogenous base,
n. [ Pyridine + -yl. ] (Chem.) A hypothetical radical,