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English definition of “girder”

girder

noun [C] uk   /ˈɡɜː.dər/ us    /ˈɡɝː.dɚ/
a long, thick piece of metal or concrete, etc. that supports a roof, floor, bridge, or other large structure: steel roof girdersPhysical supports and supportingArches, columns and beams
(Definition of girder from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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