phthalein

noun
phtha·​lein | \ ˈthal-ē-ən How to pronounce phthalein (audio) , ˈthal-ˌēn How to pronounce phthalein (audio) , ˈthāl- How to pronounce phthalein (audio) \

Medical Definition of phthalein

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

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