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  1. Oxford Dictionary

    collar beam

    • n.
      a horizontal piece of squared timber connecting two rafters and forming with them an A-shaped roof truss.

    • noun: collar beam, plural noun: collar beams

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    collar beam

    • IPA[ˈkälər bēm]
    • n.
      a horizontal wooden joist or beam connecting two rafters and forming with them an A-shaped roof ...

    Oxford American Dictionary