Etymology
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girder (n.)

"main supporting wooden 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.

updated on March 05, 2015

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Definitions of girder from WordNet

girder (n.)
a beam made usually of steel; a main support in a structure;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.