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blue blood noble, aristocratic, or socially prominent lineage. [2 definitions]
bluebonnet the cornflower. [3 definitions]
blue book an official U.S. government publication, such as a report or register, often with a blue cover. [3 definitions]
bluebottle a cornflower. [2 definitions]
blue cheese a rich strong-flavored semisoft cheese made of cow's milk and veined with blue mold.
blue-chip denoting common stock that commands a high price because of its record of steady earnings. [2 definitions]
blue chip in poker, a blue playing chip having the highest value. [3 definitions]
bluecoat one who wears a blue coat or uniform, esp. a police officer or a Union soldier in the U.S. Civil War.
blue-collar of or pertaining to industrial workers or the class of workers who earn wages rather than salaries. (Cf. white-collar.)
bluefish a blue-colored game and food fish found in temperate Atlantic waters of the North and South American coast. [2 definitions]
blue flag any of several North American wild irises that bear blue flowers.
blue fox the arctic fox during its summer bluish gray phase, or a mutant of the arctic fox that is this color throughout the year. [2 definitions]
bluegill a common edible North American sunfish of freshwater lakes and streams.
bluegrass a grass having a blue-green color and much used in pastures and lawns, found esp. in Kentucky. [2 definitions]
blue gum a tall eucalyptus tree native to Australia and widely cultivated in California, with aromatic leaves and a smooth bark that peels off in shreds.
blueing variant of bluing.
blue in the face exhausted from excessive effort or activity.
bluejacket a sailor, esp. one enlisted in the U.S. Navy.
blue jay a common jay of eastern North America, with a crest, a bright blue upper body and head, and distinctive white and black markings.
blue law any law prohibiting drinking, dancing, working, or doing business on Sunday.
Blue Man Group a creative organization that provides performance-art theater in the form of a trio of blue-painted entertainers who incorporate such elements as food, odd props, rock music, and audience participation into their show.