phenolphthalein

(redirected from Phenylthalene)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to Phenylthalene: phenylethylene

phenolphthalein

 [fe″nol-thal´ēn]
a cathartic and pH indicator.

phe·nol·phthal·e·in

(fē'nol-thal'ē-in, -thal'ēn),
A hydrogen ion indicator obtained by the action of phenol on phthalic anhydride; formerly used as a laxative.

phenolphthalein

(fē′nōl-thăl′ēn′, -thăl′ē-ĭn, -thā′lēn′, -thā′lē-ĭn)
n.
A white or pale yellow crystalline powder, C20H14O4, used as an acid-base indicator, in making dyes, and formerly in medicine as an over-the-counter laxative.