crosspiece
noun
cross·piece ˈkrȯs-ˌpēs 
: a horizontal member (as of a structure)
Example Sentences
The carpenter attached a crosspiece to each side of the frame to give extra support to the roof.
Recent Examples on the Web The thick perimeter pieces and crosspieces were joined with interlocking mortise and tenon joints. 
Washington Post, 17 June 2019
Washington Post, 17 June 2019 Word History
First Known Use
1706, in the meaning defined above
Kids Definition
crosspiece
noun
cross·piece ˈkrȯs-ˌpēs
: something placed so as to lie across something else
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