phenolphthalein Hear it!

phenolphthalein definition

phenol·phthal·ein (fē′nōl t̸hal′ēn′, -ē in; -ft̸hal′-)

noun

a white to pale-yellow, crystalline powder, CHO, used as a laxative, in making dyes, and as an acid-base indicator in chemical analysis: it is red in a solution containing a base and colorless in a solution containing an acid

Etymology: phenol + phthalein

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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