a large beam, as of steel, reinforced concrete, or timber, for supporting masonry, joists, purlins, etc.
a principal beam of wood, steel, etc., supporting the ends of joists.

1605–15; gird1 + -er1

girderless, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
girder (ˈɡɜːdə)
1.  a large beam, esp one made of steel, used in the construction of bridges, buildings, etc
2.  botany the structure composed of tissue providing mechanical support for a stem or leaf

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It is a long time from the first rain to the point when rust has eaten through
  an iron girder.
With the updated seating design, it is no longer possible to get stuck with
  seating behind a girder.
Girder properties can now easily be copied to all girders in a girder line, all
  girders in a span, and all girders in the bridge.
The initial girder size is usually selected based on past experience.
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