blue flag

noun

Definition of blue flag

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

1732

First Known Use of blue flag

1732


Medical Dictionary

blue flag

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noun \-ˈflag\

Medical Definition of blue flag

  1. 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. 2:  the dried rhizome of a blue flag—called also blue flag root


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