Either of two isomeric unsaturated compounds with the formula C5 H6 O, having a ring of five carbon atoms and one oxygen atom.
Any of a group of closed-chain compounds containing a ring, C5H6O, of one oxygen atom and five carbon atoms.
Any of a class of compounds having a ring of five carbon atoms and one oxygen atom and two double bonds. The pyran ring structure forms part of many organic compounds, especially sugars.
An unstable compound that is the simplest member of this class. Chemical formula: C5H6O.
Other Word Forms
Origin of pyran
- pyrone heterocyclic compound (pyr(o)–) (–one) –an
From American Heritage Dictionary of the English Language, 5th Edition