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barium a chemical element. Barium is usually found in compounds with other elements. (symbol: Ba)
bark1 the harsh sound made by a dog. [3 definitions]
bark2 the outside cover of the trunks, branches, and roots of woody plants. [2 definitions]
barley a plant that is like grass and whose grains are used to make food. [2 definitions]
bar mitzvah a Jewish ceremony that celebrates a boy becoming an adult and the beginning of his religious duties. The bar mitzvah usually takes place when the boy is thirteen years old.
barn a large farm building used to shelter animals or store equipment or crops.
barnacle a small sea animal that attaches its shell to rocks, the bottom of ships, docks, and other objects in shallow parts of the ocean. Barnacles float freely in the ocean when they are young. They develop shells with sharp edges as adults. Barnacles are kinds of crustaceans.
barnyard a yard or fenced area next to a barn.
barometer an instrument that measures the pressure of the atmosphere and is used to predict the weather.
baron a nobleman by birth of a particular rank.
baroness a noblewoman of a particular rank by birth or by marriage.
barrack (usually plural) a building where soldiers live for a short amount of time.
barracuda a fish that lives in warm ocean water and has a long body. Barracuda are fierce hunters.
barrage a great number of things coming one after another very quickly.
barrel a round container with a flat top and bottom and bulging sides, often made of wood boards and metal hoops. [4 definitions]
barren not able to produce or support growth. [2 definitions]
barrette a small clip used for holding hair in place.
barricade a structure that is put up quickly for protection or to block the way. [2 definitions]
barrier something that blocks the way such as a fence or wall. [2 definitions]
barrier island a long narrow island that is parallel to the mainland. A barrier island helps protect the shore from being worn away by the action of the ocean's waves.
barrio one of the districts of a town in a Spanish-speaking country. [2 definitions]