from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A white or pale yellow crystalline powder, C20H14O4, used as an acid-base indicator, in making dyes, and formerly in medicine as a laxative. Because of its toxicity, it is no longer used in over-the-counter laxatives.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A quinone derivative used as a pH indicator, and once used as a laxative
from the GNU version of the Collaborative International Dictionary of English
- n. See under Phthalein.
- A white or yellowish white crystalline substance, C20H14O4, formed by condensation of the anhydride of phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids. This reaction, being very delicate, is used as an indicator. It is sometimes used as a laxative in veterinary medicine.
- n. a white or yellowish white crystalline substance made from phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids, and as this reaction is exceedingly delicate it is used as an indicator.
from The Century Dictionary and Cyclopedia
- n. A white crystalline compound, C20H14O4, made by heating a mixture of phthalic anhydrid and phenol with a dehydrating agent, as stannic chlorid or sulphuric acid. The dilute alcoholic solution is much used as an indicator in titrating. It can he used with weak or strong acids and strong bases. It melts at 250–253° C.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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
Sorry, no etymologies found.
And also another drug called phenolphthalein, which is -- I'll tell you it's not even a drug.
The first, a presumptive test such as phenolphthalein, offers clues about where blood may be.
The Food and Drug Administration said all lots of the supplement had been recalled because it contained the weight loss drug, sibutramine (Meridia), and phenolphthalein, a chemical that may cause cancer.
The Food and Drug Administration said all lots of the supplement had been recalled because it contained the weight loss drug, sibutramine Meridia, and phenolphthalein, a chemical that may cause cancer.
Medical experts say that the ingredients that can be extremely harsh include phenolphthalein, bisacodyl, castor oil, senna, and cascara sagrada.
The FDA's analysis found ingredients including sibutramine (a controlled substance and the active ingredient in the prescription drug Meridia), rimonabant (a drug not approved for marketing in the United States), phenytoin (an anti-seizure medication) and phenolphthalein (a chemical solution and laxative used in experiments and a suspected cancer-causing agent).
Each is about the size of a quarter and oval-shaped, and she swabs one of them, then drips isopropyl alcohol, then phenolphthalein, then hydrogen peroxide on the swab and it turns bright pink.
An indicator solution of phenolphthalein in 2 per cent alcohol
I have therefore developed the determination of the carboxyl group by acidimetry by using phenolphthalein as indicator; I have further elaborated the determination of the methoxy and methylimide groups.
Into a small beaker pour 6 cc. of vinegar and 10 cc. of water and a few drops of phenolphthalein indicator.