phenolsulfonephthalein

American

[fee-nawl-suhl-fohn-thal-een, -ee-in, -fthal-, -nol-] / ˌfi nɔlˌsʌl foʊnˈθæl in, -i ɪn, -ˈfθæl-, -nɒl- /

noun

Chemistry.

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.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023