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barium a chemical element of the alkaline-earth group that has fifty-seven protons in each nucleus and that is usu. found in compounds such as salts. (symbol: Ba) [2 definitions]
barium sulfate an opaque insoluble white powder that is used as a pigment in paints and a filler for plastics and textiles, and is swallowed as a diagnostic aid in x-ray examination of the stomach and intestines.
bark1 the harsh sound made by a dog. [7 definitions]
bark2 the outside covering of the trunks, branches, and roots of woody plants. [3 definitions]
bark3 a sailing ship with between three and five masts, all but one of which are square-rigged.
bark beetle a small weevil, the adults and larvae of which burrow under the bark of conifers and other trees to feed on the inner bark, often causing great damage.
barkeeper a person who manages or owns an establishment selling alcoholic beverages. [2 definitions]
barkentine a ship with three or more masts, square-rigged on the foremast, and fore-and-aft rigged on the others.
barker1 one that makes a barking noise. [2 definitions]
barker2 a person or machine that removes bark from trees or prepares it for use in tanning leather.
bark up the wrong tree to direct one's attention, efforts, request, or accusation to the wrong person or thing.
barley a cereal plant bearing bristled grains on densely packed spikes. [2 definitions]
barleycorn barley, or a seed of the barley plant. [2 definitions]
barm yeast foam that appears atop fermenting malt liquors.
barmaid a woman who mixes or serves drinks in an establishment selling alcoholic beverages; bartender.
barman a man who mixes or serves drinks in an establishment selling alcoholic beverages; bartender.
bar mitzvah a Jewish ceremony that celebrates a boy's adulthood and the assumption of his religious duties, usu. occurring at the age of thirteen. (Cf. bat mitzvah.) [2 definitions]
barmy containing, resembling, or full of barm; yeasty, foamy, or frothy. [2 definitions]
barn a large farm building designed to house livestock or store equipment or produce.
barnacle any of a large group of marine crustaceans that are free-floating as larvae, but attach to submerged or intertidal surfaces such as wharves, rocks, ship bottoms, and the like, and form sharp-edged shells as adults. [3 definitions]
barn dance a social gathering for dancing, often held in a barn and featuring square dances.