内酯 nèizhǐ lactone Definitions Defs Origin Strokes Stroke Words Sentences Sents 丁内酯 dīngnèizhǐ butyrolactone 醋磺内酯钾 cùhuángnèizhǐjiǎ acesulfame potassium acesulfame potassium; acesulfame K (an artificial sweetener)