crossbeam

[kraws-beem, kros-]
noun
a transverse beam in a structure, as a joist.

Origin:
1585–95; cross- + beam

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Collins
World English Dictionary
crossbeam (ˈkrɒsˌbiːm)
 
n
a beam that spans from one support to another

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The traveling bar evidently crushed his head against the horizontal crossbeam.
Second, a concrete crossbeam is placed on top of the two columns.
Once the concrete cured, crews set forms to place concrete for the crossbeam.
Place the box on an interior crossbeam flush with a barn wall or directly on
  the wall itself.
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