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Related to phenolphthalein: methyl orange
phe·nol·phthal·ein(fē′nōl-thăl′ēn′, -thăl′ē-ĭn, -thā′lēn′, -thā′lē-ĭn)
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.
phenolphthalein(ˌfiːnɒlˈθeɪliːn; -lɪɪn; -ˈθæl-)
(Chemistry) a colourless crystalline compound used in medicine as a laxative and in chemistry as an indicator. Formula: C20H14O4
phe•nol•phthal•ein(ˌfi nɔlˈθæl in, -i ɪn, -ˈfθæl-, -nɒl-)
a white, crystalline compound, C20H14O4, used as an indicator in acid-base titration and as a laxative.
A white or pale-yellow, crystalline powder used as an indicator for acid and basic solutions. It is also used as a laxative and in making dyes.
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|Noun||1.||phenolphthalein - a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8|
laxative - a mild cathartic
acid-base indicator - an indicator that changes color on going from acidic to basic solutions