七碳糖 qītàntáng heptose Definitions Defs Origin Strokes Stroke Words Sentences Sents 七 qī numeral seven seven; 7; (banker's numeral) 柒 qī碳 tàn noun carbon nonmetallic element (C); the essential component of organic matter, existing in nature as diamond, graphite, and coal糖 táng noun carbohydrate carbohydrate; saccharide