girder

US /ˈɡɝː.dɚ/
UK /ˈɡɝː.dɚ/
"girder" picture
1.

a large iron or steel beam or compound structure used for building bridges and the framework of large buildings.

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The construction workers hoisted the massive steel girder into place.
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The bridge's main support consists of several parallel girders.
:
beamjoistsupportraftercrossbeam