noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Fluorescein. uncountable
2. 2
   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) wordnet

Synonyms

All synonyms

fluoresceinfluoresceinfluoresceinefluorescent dye

Etymology

From resorcinol + phthalein.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.