乙酰胆碱 yǐxiāndǎnjiǎn acetylcholine Origin Definitions Defs Strokes Stroke Words Sentences Sents 乙酰 yǐxiān acetyl (bound form) acetyl; an organic chemical group derived from acetic acid胆碱 膽鹼 dǎnjiǎn choline choline; an amine compound essential for liver function and brain development, often grouped with the vitamin B complex