fluorescein
/flʊˈrɛsiɪn/
noun
- A bright green or yellow-green dye that glows strongly under ultraviolet light, used in medicine and science to trace fluids or stain cells.
- The doctor injected fluorescein into the patient's vein to check for blockages in the eye.
- Scientists use fluorescein to track the flow of water in underground rivers.
- Under a black light, the fluorescein solution glowed a brilliant green.