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girder

[gur-der] /ˈgɜr dər/
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
1605-1615
1605-15; gird1 + -er1
Related forms
girderless, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for girderless

girder

/ˈɡɜːdə/
noun
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for girderless

girder

n.

"main supporting 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.

Online Etymology Dictionary, © 2010 Douglas Harper
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