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blue flag

4 ENTRIES FOUND:
  1. blue flag (noun)
  2. quarantine flag (noun)
  3. sweet flag (noun)
  4. yellow flag (noun)

blue flag

noun \-ˈflag\

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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