Dictionary.com

phenolphthalein

[ fee-nawl-thal-een, -ee-in, -fthal-, -nol- ]
/ ˌfi nɔlˈθæl in, -i ɪn, -ˈfθæl-, -nɒl- /
Save This Word!

noun Chemistry, Pharmacology.

a white, crystalline compound, C20H14O4, used as an indicator in acid-base titration and as a laxative.

QUIZZES

DO A DOUBLE TAKE ON THIS QUIZ ON CONTRONYMS

Look both ways before you take this quiz on contronyms, or words that can have opposite meanings.
Question 1 of 7
Choose the sentence that uses "rent" correctly.

Meet Grammar Coach

Write or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing

Meet Grammar Coach

Improve Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of phenolphthalein

First recorded in 1870–75; phenol + phthalein
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for phenolphthalein

British Dictionary definitions for phenolphthalein

phenolphthalein
/ (ˌfiːnɒlˈθeɪliːn, -lɪɪn, -ˈθæl-) /

noun

a colourless crystalline compound used in medicine as a laxative and in chemistry as an indicator. Formula: C 20 H 14 O 4
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 phenolphthalein

phenolphthalein
[ fē′nōl-thălēn′, -thălē-ĭn, -thālēn′, -thālē-ĭn ]

n.

A white or pale yellow crystalline powder that is used as an acid-base indicator and a laxative.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for phenolphthalein

phenolphthalein
[ fē′nōl-thălēn′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
FEEDBACK