Definition of barns:
(n) :
(agriculture) A building, often found on a farm, used for storage or keeping animals such as cattle.
(n) :
(nuclear physics) A unit of surface area equal to 10⁻²⁸ square metres.
(n) :
(informal, basketball, ice hockey) An arena.
(n) :
(slang) A warm and cozy place, especially a bedroom; a roost.
(v) :
(transitive) To lay up in a barn.
(n) :
(dialect, parts of Northern England) A child.