烟碱 yānjiǎn nicotine Definitions Defs Origin Strokes Stroke Words Sentences Sents 烟碱素 yānjiǎnsù niacin 烟碱酸 yānjiǎnsuān niacin niacin (vitamin B3); nicotinic acid; Pyridine-3-carboxylic acid C6H5NO2烟碱醯胺 yānjiǎnxī'àn nicotinamide nicotinamide; niacinamide