phenolphthalein
nounHow to pronounce phenolphthalein:
Definition of phenolphthalein:
- phenolphthalein (noun):
- a white or yellowish-white crystalline compound c20h14o4 used in analysis as an indicator because its solution is brilliant red in alkalies and is decolorized by acids and in medicine as a laxative
- 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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