phenolsulfonephthalein

[ fee-nawl-suhl-fohn-thal-een, -ee-in, -fthal-, -nol- ]

noun

, Chemistry.

1. a bright to dark red crystalline compound, C 1 9 H 1 4 O 5 S, slightly soluble in water, alcohol, and acetone: used as an acid-base indicator and as a diagnostic reagent in medicine.

Word History and Origins

Origin of phenolsulfonephthalein¹

phenol + sulfone + phthalein