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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]
backstroke the arm motion of a swimmer moving along on his or her back.
backward in the direction of or toward the back. [4 definitions]
backward and forward in depth; completely; thoroughly.
backyard an open area behind a house that is part of the homeowner's property.
bacon salted and smoked meat taken from the back and side of the pig.
bacteria microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. Bacteria are each made up of only one cell, but different kinds of bacteria can take different shapes. These organisms live in all parts of the earth including oceans, deserts, glaciers, hot springs, and in the bodies of most living things. While some kinds of bacteria are dangerous, most kinds are useful because they help in the digestion of food, in the making of soil, in the creation of medicines, and in many other natural processes.
bacterium singular form of bacteria.
bad not giving what is desired or required. [10 definitions]
badge a pin, patch, or ribbon people wear to show that they belong to a group, have a particular job, or have done something special.