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[fee-nawl-thal-een, -ee-in, -fthal-, -nol-] /ˌfi nɔlˈθæl in, -i ɪn, -ˈfθæl-, -nɒl-/
noun, Chemistry, Pharmacology.
a white, crystalline compound, C 2 0 H 1 4 O 4 , used as an indicator in acid-base titration and as a laxative.
Origin of phenolphthalein
1870-75; phenol + phthalein Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for phenolphthalein


/ˌfiːnɒlˈθeɪliːn; -lɪɪn; -ˈθæl-/
a colourless crystalline compound used in medicine as a laxative and in chemistry as an indicator. Formula: C20H14O4
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
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phenolphthalein in Medicine

phenolphthalein phe·nol·phthal·ein (fē'nōl-thāl'ēn', -thāl'ē-ĭn, -thā'lēn', -thā'lē-ĭn)
A white or pale yellow crystalline powder that is used as an acid-base indicator and as a laxative.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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phenolphthalein in Science
A white or pale-yellow, crystalline powder used as an indicator for acid and basic solutions. In solutions that are either neutral or basic, it is colorless, while it is pink or red in solutions that are alkali. It is also used as a laxative and in making dyes. Chemical formula: C20H14O4.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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