plate girder

noun
an iron or steel beam built up from plates and shapes welded or riveted together, usually including a plate or plates for a web, four angle irons forming two flanges, and a pair of plates to reinforce the flanges.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Three-span horizontally curved welded plate girder bridge.
The structure is comprised of a single plate girder span, flanked on each end by a steel stringer approach span.
It is continuous and may be a truss, or a box girder, or a plate girder.
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