either of two heterocyclic compounds that have a ring containing five carbon atoms and one oxygen atom with two double bonds and a second oxygen atom attached to a carbon atom in either the ortho-position (alpha pyrone) or the para-position (gamma pyrone)
2.
any one of a class of compounds that are substituted derivatives of a pyrone
pyrone in American English
(ˈpaɪˌroʊn; paɪˈroʊn)
noun
1.
either of two isomeric, unsaturated, closed-chain compounds, C5H4O2, from which several yellow dyes are derived