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

First Known Use of blue flag

1732


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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