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.

Origin of girder

First recorded in 1605–15; gird1 + -er1
Related formsgird·er·less, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for girder

truss, joist, rafter, I-beam

Examples from the Web for girder

Historical Examples of girder

British Dictionary definitions for girder



a large beam, esp one made of steel, used in the construction of bridges, buildings, etc
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

Word Origin and History for girder

"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