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built-in built as a permanent part of something larger; not able to be moved.
bulb a plant bud that begins to grow underground. Tulips and crocuses grow from bulbs. [3 definitions]
Bulgaria a country in southeastern Europe. Sofia is the capital of Bulgaria.
bulge a rounded or swollen part caused by pressure from below or within. [2 definitions]
bulk a large size or mass. [2 definitions]
bull1 an adult male of several kinds of mammals, such as cattle and elephants.
bulldog a breed of dog. Bulldogs are powerful dogs with short legs, short hair, and very strong, square jaws.
bulldozer a tractor with a large blade attached to the front that pushes or lifts soil or rocks.
bullet a small rounded or pointed metal object shot from a gun or rifle.
bulletin an announcement or report of the latest events or things of current interest. [2 definitions]
bulletin board a board on which things such as notices or advertisements are displayed. A bulletin board usually hangs on a wall either in your home or in a public place.
bullfight a public show held in an arena in which performers first tease and tire out a bull, and then one person using a cape to draw the bull near tries to kill it with a sword. Bullfighting is popular in Spain and Mexico.
bullfrog a large frog found in North America that has a loud, deep croak.
bull's-eye the center of a round target, usually marked with a small circle. [2 definitions]
bully1 someone who harasses and frightens others. [2 definitions]
bum (informal) a poor person with no home and no job; tramp. [3 definitions]
bumblebee a large, furry bee, often with black and yellow stripes. Bumblebees make a loud humming or buzzing noise when they fly.
bump to knock against or hit, often by accident. [7 definitions]
bumper the heavy bar on the front and back of cars and trucks that protects the vehicle from damage if it hits something. [2 definitions]
bumper car one of a number of miniature electric cars that are part of an amusement at a fair or carnival. People ride in the cars and try to bump into other cars or escape from being bumped. The cars are designed to be safe and enjoyable for the riders.
bump into (informal) to meet by accident or chance.