pyrone

[ pahy-rohn, pahy-rohn ]
/ ˈpaɪ roʊn, paɪˈroʊn /

noun Chemistry.

either of two heterocyclic ketones having the formula C5H4O2.

Origin of pyrone

First recorded in 1890–95; pyr- + -one
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for pyrone

pyrone
/ (ˈpaɪrəʊn, paɪˈrəʊn) /

noun

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)
any one of a class of compounds that are substituted derivatives of a pyrone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012