Phenolphthalein Definition

fēnōl-thălēn, -thălē-ĭn, -thālēn, -thālē-ĭn
noun
A white to pale-yellow, crystalline powder, C20H14O4, used in making dyes and as an acid-base indicator in chemical analysis: it is red in a solution containing a base and colorless in a solution containing an acid.
Webster's New World

(chemistry) A quinone derivative used as a pH indicator, and once used as a laxative.

Wiktionary

Other Word Forms of Phenolphthalein

Noun

Singular:
phenolphthalein
Plural:
phenolphthaleins

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phenolphthalein