phthalein

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

nounChemistry.

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

Origin of phthalein

First recorded in 1900–05; (na)phthale(ne) + -in²

Words Nearby phthalein

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use phthalein in a sentence

When heated with caustic alkalis it yields dibromresorcin and dibrommonoresorcin-phthalein.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 | Various
The phthalein on the day following the second venesection was 45 per cent in two hours.
Arteriosclerosis and Hypertension: | Louis Marshall Warfield
The phthalein excretion is quite normal and the excretions of salt and nitrogen are also normal.
Arteriosclerosis and Hypertension: | Louis Marshall Warfield

British Dictionary definitions for phthalein

phthalein

/ (ˈθeɪliːn, -lɪɪn, ˈθæl-, ˈfθæl-) /

noun

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

Origin of phthalein

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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for phthalein

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.

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