WordReference Random House Unabridged Dictionary of American English © 2025
box gird′er. 
  1. Building, Civil EngineeringSee box beam. 
  • 1860–65

Collins Concise English Dictionary © HarperCollins Publishers::
box girder
  1. a girder that is hollow and square or rectangular in shape
'box girder' also found in these entries (note: many are not synonyms or translations):

Forum discussions with the word(s) "box girder" in the title:


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