Noun barn has 2 senses
  1. barn - an outlying farm building for storing grain or animal feed and housing farm animals
    --1 is a kind of
    farm building
    --1 has particulars: cowbarn, cowshed, cow barn, cowhouse; tithe barn
  2. barn, b - (physics) a unit of nuclear cross section; the effective circular area that one particle presents to another as a target for an encounter
    --2 is a kind of area unit, square measure
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