A large, strong metal or wooden beam that supports bridges, buildings, or other big structures.
From *gird* (to encircle, bind) + *-er*, originally meaning something that girds or supports. As engineering advanced, the term settled on the big horizontal beams in construction. It emphasizes the role of ‘holding together’ a structure.
Girders are the hidden skeletons of skyscrapers and bridges — you rarely see them once the structure is finished. The word comes from the idea of ‘girding’ or binding, showing that sometimes the most important work is done by what stays out of sight.
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