'C5H4O2' definitions:

Definition of 'C5H4O2'

From: GCIDE

Pyrone \Py`rone\, n. [G. pyron, an abbr. of pyrokoman.] (Org. Chem.) An unsaturated cyclic compound, C5H4O2, of which two varieties are known, [alpha] and [gamma]. [gamma]-pyrone is the parent substance of several natural yellow dyestuffs.