girder








noun

  1. a large beam, as of steel, reinforced concrete, or timber, for supporting masonry, joists, purlins, etc.
  2. a principal beam of wood, steel, etc., supporting the ends of joists.

noun

  1. a large beam, esp one made of steel, used in the construction of bridges, buildings, etc
  2. botany the structure composed of tissue providing mechanical support for a stem or leaf
n.

“main supporting beam that carries flooring,” 1610s, agent noun from gird, on notion of something that “holds up” something else. Used of iron bridge supports from 1853.

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