[pahy-ruh-nohs, -nohz] /ˈpaɪ rəˌnoʊs, -ˌnoʊz/
any monosaccharide having a ring structure.
pyranose py·ra·nose (pī’rə-nōs’, -nōz’)
A cyclic form of a sugar in which an oxygen bridges two carbon atoms, thus forming a ring containing five carbon atoms and an oxygen atom.
[pir-uh-zin-uh-mahyd, -mid] /ˌpɪr əˈzɪn əˌmaɪd, -mɪd/ noun, Pharmacology. 1. a substance, C 5 H 5 N 3 O, used in the treatment of tuberculosis.
pyrazine (pĭr’ə-zēn’) Any of a group of organic compounds having a six-member ring in which the first and fourth atoms are nitrogen and the rest are carbon. Pyrazines are components of many important compounds, including pteridines, some vitamins and antibiotics, and numerous dyes called phenazines.
[pi-raz-uh-leen, -lin, pahy-] /pɪˈræz əˌlin, -lɪn, paɪ-/ noun, Chemistry. 1. any of the group of heterocyclic compounds containing three carbon atoms, two adjacent nitrogen atoms, and one double bond in the ring. 2. the parent compound, C 3 H 6 N 2 .
noun, Chemistry. 1. any of the group of dyes, as tartrazine, derived from a pyrazolone: used chiefly to dye silk and wool.