Definition of phenolphthalein in English:

Share this entry

phenolphthalein

Pronunciation: /ˌfēnəlˈTHālēən/

noun

Chemistry
A colorless crystalline solid (pink in alkaline solution) used as an acid-base indicator and medicinally as a laxative.
  • Chemical formula: C20H14O4
Example sentences
  • The maintenance phase consisted of ‘Agarol’ (active ingredients: liquid paraffin, phenolphthalein, benzoic acid, and sorbic acid) 5-30 ml once or twice daily, senna granules, or bisacodyl tablets.
  • The non-osmotic laxatives, phenolphthalein and senna, partly act by stimulating secretory mechanisms in the intestine.
  • The listing is based on findings from feeding studies of phenolphthalein that caused cancer in multiple organs in multiple species of experimental animals.

Origin

Late 19th century: from phenol + -phthal- (from naphthalene) + -in1.

For editors and proofreaders

Syllabification: phe·nol·phthal·ein

Share this entry
 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.