[1] : The Collaborative International Dictionary of English v.0.48

barn \barn\ baumrn, n. oe. bern, as. berern, bern; bere
   barley + ern, aern, a close place. root92. see barley.
   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.
   1913 webster

   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.
      1913 webster
see also:
barley barn owl aluco flammeus strix flammea barn swallow hirundo horreorum 

[2] : The Collaborative International Dictionary of English v.0.48

barn \barn\, v. t.
   to lay up in a barn. obs. --shak.
   1913 webster

         men . . . often barn up the chaff, and burn up the
         grain.                                   --fuller.
   1913 webster

[3] : The Collaborative International Dictionary of English v.0.48

barn \barn\, n.
   a child. see bairn. obs.
   1913 webster
see also:
bairn 

[4] : WordNet (r) 2.0

barn
     n 1: an outlying farm building for storing grain or animal feed
          and housing farm animals
     2: physics a unit of nuclear cross section; the effective
        circular area that one particle presents to another as a
        target for an encounter syn: b
see also:
b 

[5] : Jargon File (4.3.1, 29 Jun 2001)

barn n. uncommon; prob. from the nuclear military an unexpectedly
   large quantity of something: a unit of measurement. "why is /var/adm
   taking up so much space?" "the logs have grown to several barns." the
   source of this is clear: when physicists were first studying nuclear
   interactions, the probability was thought to be proportional to the
   cross-sectional area of the nucleus this probability is still called
   the cross-section. upon experimenting, they discovered the interactions
   were far more probable than expected; the nuclei were `as big as a
   barn'. the units for cross-sections were christened barns, 10^-24 cm^2
   and the book containing cross-sections has a picture of a barn on the
   cover.

[6] : Easton's 1897 Bible Dictionary

barn
   a storehouse deut. 28:8; job 39:12; hag. 2:19 for grain, which
   was usually under ground, although also sometimes above ground
   luke 12:18.
   

[7] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

barn, estates. a building on a farm used to receive the crop, the stabling 
of animals, and other purposes. 
     2. the grant or demise of a barn, without words superadded to extend 
its meaning, would pass no more than the barn itself, and as much land as 
would be necessary for its complete enjoyment. 4 serg.  rawle, 342. 

Barn >> B Words
Barn, definition of term: Barn
barn_pag1.html

Barn Owl >> B Words
Barn Owl, definition of term: Barn Owl
barn+owl_pag1.html