phenolphthalein

/ˌˈfinəlˌθeɪˈli(ə)n/
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Definitions of phenolphthalein
  1. noun
    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
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    type of:
    laxative
    a mild cathartic
    acid-base indicator
    an indicator that changes color on going from acidic to basic solutions
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