| 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] |
| backhand |
a tennis stroke that involves a forward movement of the arm with the back of the hand outward. |
| backhoe |
a machine that is used for digging. It has a large metal bucket that scoops something up and toward the machine. |
| back out of |
to fail to do something that was agreed upon. |
| backpack |
a pack used to carry objects on one's back while hiking or walking. [2 definitions] |
| back road |
a road that avoids traffic and high speed travel. It is often a small, country road that goes through areas with few houses and buildings. |
| back seat |
the seat or seating area behind other seats, especially in a car or other vehicle. |
| backstroke |
the arm motion of a swimmer moving along on his or her back. |