See Also: phenolphthalein(medicine)
phenolphthalein(dictionary)

phenolphthalein (iou)



phenolphthalein noun. L19.
[from PHENOL + PHTHALIC + -EIN.]
A whitish or yellowish crystalline solid, C20H14O4, which is used as an indicator in the pH range 8 (colourless) to 10 (red), and medicinally as a laxative.