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Phenolphthalein; Phenol Phthalein

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Webster's 1828 Dictionary · 1828

Part of speech: noun (n.)

A white or yellowish white crystalline substance, C20H14O4, formed by condensation of the anhydride of phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids. This reaction, being very delicate, is used as an indicator.

Noah Webster's American Dictionary of the English Language (1828). Structured JSON vendored from sktzofrenic/webster1828 at commit 5a58d9e0191eefaa51affbc1bb1b8bc5782ba6c0. The upstream README identifies the dictionary text as public domain and the project license as MIT.

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