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• PHENOLPHTHALEIN (noun) The noun PHENOLPHTHALEIN has 1 sense: 1. a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8 Familiarity information: PHENOLPHTHALEIN used as a noun is very rare.
