~ 1
■ noun
1》 a large farm building used for storage or for housing livestock.
2》 N. Amer. a large shed for storing road or railway vehicles.
Origin
OE bern , berern , from bere 'barley' + ern , ærn 'house'.
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~ 2
(abbrev.: b )
■ noun Physics a unit of area, 10 -28 square metres, used especially in particle physics.
Origin
1940s: appar. from the phr. as big as a ~ door .