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phthalein

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

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

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Origin of phthalein

First recorded in 1900–05; (na)phthale(ne) + -in2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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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

Word Origin for 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

Medical definitions for phthalein

phthalein

n.

Any of a group of chemical compounds formed by a reaction of phthalic anhydride with a phenol, from which certain synthetic dyes are derived.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for phthalein

phthalein
[ thălēn′, thālēn′, 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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