Py′rone (?), n. [G. pyron, an abbr. of pyrokoman.] (Org. Chem.) An unsaturated cyclic compound, C5H4O2, of which two varieties are known, α and γ. γ-pyrone is the parent substance of several natural yellow dyestuffs.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.