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barrier island a long narrow sandy island formed parallel to a shore protecting it from erosion.
barrier reef a ridge of coral running parallel to a coast.
barring except in the case of; except for.
barrio in a Spanish-speaking country, one of the districts of a town. [2 definitions]
barrister (chiefly British) a lawyer who is qualified to offer legal advice and to represent clients in both the lower and higher courts in the UK.
barroom a room where alcoholic beverages are served, usu. at a bar or counter.
barrow1 a flat, rectangular frame used for carrying a load, supported by handles at each end or handles at one end and a wheel at the other; wheelbarrow.
barrow2 a burial mound.
barrow3 a castrated hog.
bar sinister in heraldry, a bar on a shield that runs diagonally from lower left to upper right, signifying an illegitimate ancestor; bend sinister. [3 definitions]
bartender one who prepares and distributes drinks at an establishment or counter serving alcoholic beverages.
barter to trade services or commodities without the use of money. [5 definitions]
bartizan a small extended turret atop a wall or tower, used as a vantage point for a watchman or defender.
Bartlett a large yellow juicy variety of pear.
Baruch Spinoza a Dutch philosopher (b.1632--d.1677).
baryon in physics, a heavy subatomic particle of half-integral spin, such as a proton, neutron, or hyperon.
barytes the principal ore of barium; barite.
basal at, pertaining to, or comprising the bottom part or support. [3 definitions]
basal metabolism the minimum expense of energy that is necessary for life in a resting organism.
basalt a dense, fine-grained, dark-colored igneous rock created by lava flow that is rich in minerals containing magnesium and iron. The most common igneous rock on the Earth's surface due to its high abundance on the ocean floor.
bascule a counterweighted balance, esp. that used in bridges that are raised and lowered.