Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Either of two isomeric unsaturated compounds with the formula C5H6O, having a ring of five carbon atoms and one oxygen atom.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry Any of a class of heterocyclic compounds containing a ring of five carbon atoms and an oxygen atom; especially the simplest one, C5H6O.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[pyrone, heterocyclic compound (pyr(o)– + –one) + –an.]

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