1. Noun. A pH indicator that can also be used to make invisible ink. ¹
¹ Source: wiktionary.com
Medical Definition of Thymolphthalein
1. 5',5''-diisopropyl-2',2''-dimethylphenolphthalein. Used as a pH indicator and as a reagent for blood after decolorizing the alkaline solution by boiling with zinc dust.
Pharmacological action: indicators and reagents, phthalein dyes.
Chemical name: 1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxy-2-methyl-5-(1-methylethyl)phenyl)-
(12 Dec 1998)
