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Phenolphthalein

//ˌfiː.nɒlˈ(f)θa.liːn// noun

Definitions

Noun
  1. 1
    A white or yellowish-white crystalline compound C₂₀H₁₄O₄ used in medicine as a laxative and in analysis as an indicator because its solution is brilliant red in alkalies and is decolorized by acids. countable, uncountable
  2. 2
    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 wordnet

Etymology

From phenol + phthalein.

See also for "phenolphthalein"

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