Girderless

girder

[gur-der]
noun
1.
a large beam, as of steel, reinforced concrete, or timber, for supporting masonry, joists, purlins, etc.
2.
a principal beam of wood, steel, etc., supporting the ends of joists.

Origin:
1605–15; gird1 + -er1

girderless, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
girder (ˈɡɜːdə)
 
n
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

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