barn
barn (bärn) n.
[[ME < OE bern, berern < bere, barley + ærn, house: see rest1]]
1 a farm building for sheltering harvested crops, livestock, machines, etc.
☆ 2 a large building for streetcars, trucks, etc.
☆ 3
[[arbitrary use, from phr. as big as a barn]]
Nuclear Physics a unit of area used to show the degree of probability that a nuclear reaction will occur: 1 barn = a magnitude of 10-24 sq cm per nucleus: abbrev. b: see cross section