Noun
acridine orange (uncountable)
English Wikipedia has an article on:acridine orangeWikipedia
(chemistry) A cationic dye, prepared from coal tar and creosote oil, often used in epifluorescence microscopy.
Acridine orange (3,6-dimethylaminoacridine) is a nucleic acid -selective metachromatic stain useful for cell cycle determination. Source: Internet