crosspiece
From Longman Dictionary of Contemporary EnglishRelated topics: Constructioncrosspiececross‧piece /ˈkrɒspiːs $ ˈkrɒːs-/ noun [countable] TBCsomething that lies across another thing, especially in a building, on a railway track etcExamples from the Corpuscrosspiece• On the crosspiece he had painted the words: Oliver Bean.• The filter was constructed as shown in the diagram and then stood on the wooden crosspieces on top of the vat.• A carpenter from Sam Son who had prepared the wooden crosspieces for the test raft was one member of the test-raft crew.