iodophthalein

noun
io·​do·​phtha·​lein | \ī-ˌōd-ə-ˈthal-ē-ən, ī-ˈäd-, -ˈthal-ˌēn, -ˈthāl-\

Medical Definition of iodophthalein 

: a derivative of phenolphthalein or its soluble blue-violet crystalline disodium salt C20H8I4Na2O4 used to render the gallbladder opaque to X-rays and formerly to treat typhoid carriers

called also tetraiodophenolphthalein

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