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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