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B symbol of the chemical element boron.
b the second letter of the English alphabet. [3 definitions]
Ba symbol of the chemical element barium.
B.A. a college degree earned after four years of study. B.A. is an abbreviation for Bachelor of Arts.
baa to make the sound of a sheep; bleat. [2 definitions]
babble to speak without making sense. [5 definitions]
babe a baby.
baboon a large monkey that has a long snout like a dog's. Baboons live on the ground in large groups in Africa and Arabia. They can be powerful fighters.
baby a very young girl or boy; infant. [6 definitions]
baby boom the great increase in the population of the United States that took place between 1946 and 1960.
babysit to take care of children while their parents are away.
babysitter a person who takes care of children when their parents are not with them.
baby tooth one of the first set of teeth in human babies and other mammals. Baby teeth fall out early in life to be replaced by adult teeth.
bachelor a man who has not married.
back the part of the body of a human or animal that is on the opposite side from the chest and between the neck and hips. [10 definitions]
back and forth moving backward then forward, or forward then backward, often many times without stopping.
backboard the board to which a basketball hoop is attached.
backbone the row of bones that runs along the center of the back; spine. [2 definitions]
backfire to give off a loud explosive noise that means the engine of a car or other vehicle is not working properly. [3 definitions]
backgammon a board game played by two people. The players throw dice and move their pieces around and then off the board.
background the part of a picture or scene that is towards the back or seems to be furthest away. [2 definitions]