| barn | (noun) an outlying farm building for storing grain or animal feed and housing farm animals | - |
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| (noun) (physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter | Synonyms: b |
| barnacle | (noun) marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces | Synonyms: cirriped, cirripede |
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| (noun) European goose smaller than the brant; breeds in the far north | Synonyms: barnacle goose, Branta leucopsis |
| barnburner | (noun) an impressively successful event | - |
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| (noun) someone who burns down a barn | - |
| barndoor | (noun) an opaque adjustable flap on a lamp fixture; used in photography to cut off light from particular areas | - |
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| barnful | (noun) the quantity that a barn will hold | - |
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| barnstorm | (verb) tour the country making political speeches, giving lectures, or presenting plays | - |
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| (verb) appear at county fairs and carnivals as a stunt flier and parachute jumper | - |
| barnstormer | (noun) a pilot who travels around the country giving exhibits of stunt flying and parachuting | Synonyms: stunt flier, stunt pilot |
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| (noun) an actor who travels around the country presenting plays | Synonyms: play-actor, playactor, trouper |
| barnyard | (noun) a yard adjoining a barn | - |
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