phenolphthalein /phe·nol·phthal·ein/ (fe″nol-thal´ēn) a cathartic and pH indicator, with a range of 8.5 to 9.0.
phenolphthalein
phe·nol·phthal·ein (f  n l-th l n, -thl- n, -th ln, -thl-n)n. A white or pale yellow crystalline powder that is used as an acid-base indicator and a laxative. |
phenolphthalein
[fē′nolthal′ē·in, -thā′lēn]
1 a cathartic and pH indicator with a range of 8.5 (colorless) to 9.0 (red).
2 an indicator of hydrogen ion in urine and gastric juice.
phenolphthalein
1. an acid-base indicator dye; it is colorless below pH 8.5, but turns red above pH 9.0.
2. in monogastric animals, a cathartic administered orally, usually with a bulk laxative such as agar. When ingested by ruminants causes the urine to change color to red on exposure to air.
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