| 释义 | py·rone \ˈpīˌrōn\ noun
 (-s)
 Etymology: International Scientific Vocabulary pyr- + -one
 1.  : either of two isomeric carbonyl compounds C5H4O2 derived from pyran:
 a.  : an oily liquid delta-lactone; 2H-pyran-2-one — called also alpha-pyrone, 2-pyrone; compare coumalin, coumarin
 b.  : a hygroscopic crystalline compound; 4H-pyran-4-one — called also gamma-pyrone, 4-pyrone; compare chromone; structural formula
 2.  : a derivative of either of the pyrones
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