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.
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