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barium sulphate
bark (1)
bark (2)
bark (3)
bark beetle
barkeeper
barker (1)
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barker channel
barking
barking deer
barley
barley sugar
barley water
barley wine
barleycorn
Barlow knife
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barn (2)
barn [ baarn ] (plural barns)


noun 
Definition:
 
unit of area: a unit of area equal to 10-28 square metres, used in nuclear physics
[Mid-20th century. <as big as a barn door]
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