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blue flag

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blue flag

–noun
any North American plant of the genus Iris, esp. I. versicolor: the state flower of Tennessee.

Origin:
1775–85, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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blue flag  
n.  Any of several irises having blue or blue-violet flowers, especially Iris versicolor of eastern North America.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: blue flag
Pronunciation: -'flag
Function: noun
1 : either of two common blue-flowered irises (Iris versicolor and I.virginica) of the eastern and central U.S. with rhizomes formerly used medicinally as a cathartic and emetic
2 : the dried rhizome of a blue flag called also blue flagroot
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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