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Children's Dictionary
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build up to grow in size, amount, or intensity. [2 definitions]
built the past tense and past participle of build.
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]