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.

---

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

---

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.

---

Etymology

Origin of phthalein

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

Example Sentences

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

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

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

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

The phthalein excretion is normal or only slightly reduced.

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