hydropyridine

from The Century Dictionary.

• noun A class name applied, in organic chemistry, to compounds derived from pyridine by the addition of two, four, or six atoms of hydrogen, respectively, giving derivatives of dihydropyridine, C₅H₇N, tetrahydropyridine, C₅H₉N, and hexyhydropyridine, C₅H₁₁N. Many of the compounds are closely related to alkaloids and to ptomaïnes.