blue flag

noun

Definition of blue flag

: a blue-flowered iris; especially : a common iris (Iris versicolor) chiefly of the eastern U.S. with a root formerly used medicinally

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First Known Use of blue flag

1732

in the meaning defined above

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Medical Dictionary

blue flag

noun \ -ˈflag \

medical Definition of blue flag

1 : either of two common blue-flowered irises (Iris versicolor and I. virginica) of the eastern and central United States with rhizomes formerly used medicinally as a cathartic and emetic
2 : the dried rhizome of a blue flag called also blue flag root

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