phthalein

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

Phonetic (Standard)IPA

noun

, Chemistry.

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

phthalein

/ -lɪɪn; ˈfθæl-; ˈθæl-; ˈθeɪliːn /

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

phthalein

/ thăl′ēn′,thā′lēn′,fthăl′- /

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.

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

C19: from phthal-, shortened form of naphthalene + -in

When heated with caustic alkalis it yields dibromresorcin and dibrommonoresorcin-phthalein.

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

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

April 23, 2024inveterate

[in-vet-er-it ]

Start each day with the Word of the Day in your inbox!

By clicking "Sign Up", you are accepting Dictionary.com Terms & Conditions and Privacy Policies.

Browse