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Noun: phenolphthalein  ,fee-n(u)l'they,leen
  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 colourless below pH 8

Derived forms: phenolphthaleins

Type of: acid-base indicator, laxative

Encyclopedia: Phenolphthalein