English edit

 
Chemical structure of phenolphthalein
 
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Etymology edit

From phenol +‎ phthalein.

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Noun edit

phenolphthalein (countable and uncountable, plural phenolphthaleins)

  1. (organic chemistry, pharmacology) 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.

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