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phenolphthalein

Syllabification: (phe·nol·phthal·ein)
Pronunciation: /ˌfēnəlˈTHālē(i)n/
Definition of phenolphthalein

noun

Chemistry
  • a colorless crystalline solid (pink in alkaline solution) used as an acid-base indicator and medicinally as a laxative.
    • Chemical formula: C20H14O4

Origin:

late 19th century: from phenol + -phthal- (from naphthalene) + -in1

phenolphthalein in other Oxford dictionaries

Definition of phenolphthalein in the British & World English dictionary

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