phthalein

[thal-een, -ee-in, fthal-]

noun

Chemistry.

1. any of a group of compounds formed by treating phthalic anhydride with phenols, from which certain important dyes are derived.

phthalein

/ ˈθæl-, ˈfθæl-, -lɪɪn, ˈθeɪliːn /

noun

1. any of a class of organic compounds obtained by the reaction of phthalic anhydride with a phenol and used in dyes

phthalein

1. Any of a group of chemical compounds formed by a reaction of phthalic anhydride with a phenol. They are used to derive certain synthetic dyes.

Word History and Origins

Origin of phthalein¹

First recorded in 1900–05; (na)phthale(ne) + -in ²

Word History and Origins

Origin of phthalein¹

C19: from phthal-, shortened form of _naphthalene + _-in

Example Sentences

Phthalein, thal′e-in, n. one of a very important class of dye-yielding materials formed by the union of phenols with the anhydride of phthalic acid.—adj.

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Phthal′in, a colourless crystalline compound obtained by reducing phthalein.

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The phthalein on the day following the second venesection was 45 per cent in two hours.

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The phthalein excretion is normal or only slightly reduced.

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The phthalein elimination was 65 per cent in two hours.

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