[thal-een, -ee-in, fthal-]
any of a group of compounds formed by treating phthalic anhydride with phenols, from which certain important dyes are derived.
Origin of phthalein
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for phthalein
Historical Examples of 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.
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
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.
[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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.