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

First Known Use of blue flag

1732


Medical Dictionary

blue flag

play
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


Learn More about blue flag


Seen and Heard

What made you want to look up blue flag? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

sad or melancholy

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • istock-refers-to-this-as-a-tumble-of-strawberries-which-sounded-pretty-nice-to-us
  • Which is a synonym of garner?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!