blue flag
noun
any North American plant of the genus Iris, especially I. versicolor: the state flower of Tennessee.
Origin of blue flag
An Americanism dating back to 1775–85
Words nearby blue flag
blue dogwood,
blue dome cyst,
blue duck,
blue ensign,
blue false indigo,
blue flag,
blue flash,
blue flu,
blue fox,
blue funk,
blue funk, in a
British Dictionary definitions for blue flags
Blue Flag
noun
an award given to a seaside resort that meets EU standards of cleanliness of beaches and purity of water in bathing areas