fluo•res•ce•in(flŏŏ res′ē in, flô-, flō-),USA pronunciationn.[Chem.]
Chemistryan orange-red, crystalline, water-insoluble solid, C20H12O5, that in alkaline solutions produces an orange color and an intense green fluorescence: used to trace subterranean waters and in dyes.
Also, flu′o•res′ce•ine.Also called resorcinolphthalein.