a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed)
fluo.res.ce.in n.（名词）An orange-red compound, C20H 2O 5, that exhibits intense fluorescence in alkaline solution and is used in medicine, in oceanography, and as a textile dye. 荧光素：一种在碱性溶液里发出强烈荧光的桔红色化合物，C20H 2O 5，用于医药、海洋学和作为纺织染料
