Phthalein /(?)/

Phthal·e·in

Phthalein

n.
  1. One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenolphthalein. Their alkaline solutions are fluorescent. (Chem.)

Phrases & Compounds
Phenol phthalein
a white or yellowish white crystalline substance made from phthalic acid and phenol. Same as phenolphthalein.