Dictionary

blue flag

noun

Definition of BLUE FLAG

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

First Known Use of BLUE FLAG

1784

blue flag

noun \-ˈflag\   (Medical Dictionary)

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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