Barn n.  A covered building used chiefly for storing grain, hay, and other productions of a farm.  In the United States a part of the barn is often used for stables.
 Barn owl Zool., an owl of Europe and America (Aluco flammeus, or Strix flammea), which frequents barns and other buildings.
 Barn swallow Zool., the common American swallow (Hirundo horreorum), which attaches its nest of mud to the beams and rafters of barns.


 barn swallow
      n : common swallow of North America and Europe that nests in
          barns etc. [syn: chimney swallow, Hirundo rustica]