Defn: Related to, or formed from, pyridin or its homologues; as, the pyridic bases.
PYRIDINE
Pyr"i*dine, n. Etym: [From Gr. (Physiol. Chem.)
Defn: A nitrogenous base, C5H5N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colorless liquid with a peculiar pungent odor. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptomaïnes, may be mentioned. See Lutidine.
PYRIDYL
Pyr"i*dyl, n. Etym: [Pyridine + -yl.] (Chem.)
Defn: A hypothetical radical, C5H4N, regarded as the essential residue of pyridine, and analogous to phenyl.
PYRIFORM Pyr"i*form, a. Etym: [L. pyrum, pirum, a pear + -form: cf. F. pyriforme, piriforme.]
Defn: Having the form of a pear; pear-shaped.
PYRITACEOUS
Pyr`i*ta"ceous, a. (Min.)
Defn: Of or pertaining to pyrites. See Pyritic.
PYRITE
Pyr"ite, n.; pl. Pyrites. Etym: [Cf. F. pyrite. See Pyrites.] (Min.)