phthalein

American  

[thal-een, -ee-in, fthal-] / ˈθæl in, -i ɪn, ˈfθæl- /

noun

Chemistry.

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

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phthalein British  

/ 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

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phthalein Scientific  

/ thăl′ēn′,thā′lēn′,fthăl′- /

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.

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Etymology

Origin of phthalein

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

Example Sentences

As the case advances the phthalein output becomes less and less, until a period is reached when there are only traces or complete suppression at the end of a two-hour period.

From Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. by Warfield, Louis Marshall

The urine was acid, of normal specific gravity, normal in amount, normal phthalein, normal concentration of salt and nitrogen, contained albumin only when he was suffering from decompensation of the heart.

From Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. by Warfield, Louis Marshall

A similar demonstration may be made by allowing drops of acid to diffuse through solutions of gelatine made slightly alkaline and coloured with phenol phthalein.

From The Mechanism of Life by Leduc, Stéphane

The phthalein excretion is quite normal and the excretions of salt and nitrogen are also normal.

From Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. by Warfield, Louis Marshall

Several glass plates are prepared, by spreading on each a solution of gelatine of different concentration, to which a few drops of phenol phthalein have been added.

From The Mechanism of Life by Leduc, Stéphane