| barretter | (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations) | Synonyms: ballast, ballast resistor |
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| barricade | (noun) a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc. | Synonyms: roadblock |
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| (noun) a barrier (usually thrown up hastily) to impede the advance of an enemy | - |
| barrier | (noun) a structure or object that impedes free movement | - |
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| (noun) any condition that makes it difficult to make progress or to achieve an objective | Synonyms: roadblock |
| (noun) anything serving to maintain separation by obstructing vision or access | - |
| barring | (noun) the act of excluding someone by a negative vote or veto | Synonyms: blackball |
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| barrio | (noun) an urban area in a Spanish-speaking country | - |
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| (noun) a Spanish-speaking quarter in a town or city (especially in the United States) | - |
| barrister | (noun) a British or Canadian lawyer who speaks in the higher courts of law on behalf of either the defense or prosecution | - |
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| barroom | (noun) a room or establishment where alcoholic drinks are served over a counter | Synonyms: bar, ginmill, saloon, taproom |
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| barrow | (noun) a cart for carrying small loads; has handles and one or more wheels | Synonyms: garden cart, lawn cart, wheelbarrow |
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| (noun) (archeology) a heap of earth placed over prehistoric tombs | Synonyms: burial mound, grave mound, tumulus |
| (noun) the quantity that a barrow will hold | Synonyms: barrowful |
| barrowful | (noun) the quantity that a barrow will hold | Synonyms: barrow |
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| bars | (noun) gymnastic apparatus consisting of two parallel wooden rods supported on uprights | Synonyms: parallel bars |
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| bartender | (noun) an employee who mixes and serves alcoholic drinks at a bar | Synonyms: barkeep, barkeeper, mixologist |
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| barter | (noun) an equal exchange | Synonyms: swap, swop, trade |
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| barterer | (noun) a trader who exchanges goods and not money | - |
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| bartlett | (noun) juicy yellow pear | Synonyms: bartlett pear |
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| bartonia | (noun) annual grown especially for its fragrant golden nocturnal flowers | Synonyms: Mentzelia lindleyi |
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| barunduki | (noun) terrestrial Siberian squirrel | Synonyms: baranduki, baronduki, burunduki, Eutamius asiaticus, Eutamius sibiricus |
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| barycenter | (noun) (astronomy) the common center of mass around which two or more bodies revolve | - |
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| barye | (noun) the absolute unit of pressure equal to one dyne per square centimeter | Synonyms: bar absolute, microbar |
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| baryon | (noun) any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1 | Synonyms: heavy particle |
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| baryta | (noun) any of several compounds of barium | - |
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| barytes | (noun) a white or colorless mineral (BaSO4); the main source of barium | Synonyms: barite, barium sulphate, heavy spar |
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| barytone | (noun) a male singer | Synonyms: baritone |
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