Medical Dictionary


play play play
noun phtha·lein \ˈthal-ē-ən, ˈthal-ˌēn, ˈthāl-\

Medical Definition of phthalein

  1. :  any of various xanthene dyes (as phenolphthalein or fluorescein) that are intensely colored in alkaline solution

Seen and Heard

What made you want to look up phthalein? Please tell us where you read or heard it (including the quote, if possible).