1. fluorescein

noun. 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).


  • absorption indicator
  • eosin
  • resorcinolphthalein
  • fluoresceine
  • bromeosin
  • fluorescent dye
  • dyestuff


  • -in (English)
  • fluoresce (English)

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Sentences with fluorescein

1. Noun, singular or mass
Use the spoon to get a small amount of the fluorescein powder and stir it into the water.

2. Adjective
The bigger the amount of water, the larger the amount of fluorescein powder you will need to react with it.