phenolphthalein

American  

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

noun

Chemistry, Pharmacology.

1. a white, crystalline compound, C 2 0 H 1 4 O 4 , used as an indicator in acid-base titration and as a laxative.

---

phenolphthalein British  

/ -lɪɪn, ˌfiːnɒlˈθeɪliːn, -ˈθæl- /

noun

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

---

phenolphthalein Scientific  

/ fē′nōl-thăl′ēn′ /

1. 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: C ₂₀ H ₁₄ O ₄ .

---

Etymology

Origin of phenolphthalein

First recorded in 1870–75; phenol + phthalein

Example Sentences

Still other dietary supplement products for weight loss contained the laxative phenolphthalein or prescription diuretics.

From Salon

A chemical called phenolphthalein -- not approved by FDA -- was found in a Chinese product called Zi Xiu Tang Beauty Face & Figure Capsule.

From US News

Some of the supplements also contain another chemical used previously in over-the-counter laxative products, a dye called phenolphthalein.

From Forbes

Add 50 to 100 cc. hot, neutral alcohol, and titrate with N/2, N/4 or N/10 sodium hydroxide depending on the fatty acid content, using phenolphthalein as indicator.

From Project Gutenberg

Titrate the distillate with N/10 alkali, using phenolphthalein as an indicator.

From Project Gutenberg