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girder
(gʉr′dər)
noun
a large beam, usually horizontal, of timber or steel, for supporting the joists of a floor, the framework of a building, the superstructure of a bridge, etc.
Origin: gird + -er
See girder in American Heritage Dictionary 4
noun
A beam, as of steel, wood, or reinforced concrete, used as a main horizontal support in a building or bridge.
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