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bluet a blue-flowered plant such as the cornflower.
blue whale the largest whale, as much as one hundred feet long, with a bluish gray back, yellow undersides, and grooves running lengthwise on the throat and abdomen.
bluff1 a hill or shoreline with a steep face. [3 definitions]
bluff2 to mislead someone by using false pretenses. [6 definitions]
bluing a chemical substance, such as indigo, applied to laundry to keep it from yellowing.
blunder a careless or thoughtless mistake. [5 definitions]
blunderbuss an early shoulder-gun having a short barrel, flared at the muzzle to scattershot at close range. [2 definitions]
blunt having a dull edge or point; not sharp. [5 definitions]
blur to cause to run together or become obscure or confused, as by smearing. [7 definitions]
blurb a short description written to promote or advertise a product, as on book jackets.
blurt to utter abruptly, awkwardly, and without discretion (usu. fol. by out).
blush to become red in the face as an involuntary expression of shame, confusion, or other self-conscious discomfort. [7 definitions]
blusher one who blushes or tends to blush. [2 definitions]
blush wine any of certain dry, slightly pink wines made from red-wine grapes.
bluster to blow noisily and in gusts, as the wind. [5 definitions]
Blvd. abbreviation of "boulevard," a wide city street, often lined with trees or landscaped (used in a proper name).
BM abbreviation of "bowel movement," the evacuation of waste matter from the bowels.
BMOC abbreviation of "big man on campus" (used to characterize a popular or admired male student, or sometimes one who aggressively promotes his own advancement).
BMX abbreviation of "bicycle motocross," a sport in which bicycles designed for rough terrain are raced on such terrain, or used in the performance of athletic feats such as jumps, spins, and flips. [2 definitions]
B.O. abbreviation of "body odor."
boa see boa constrictor. [2 definitions]