crosstree

[kraws-tree, kros-] /ˈkrɔsˌtri, ˈkrɒs-/
noun
1.
Nautical. either of a pair of timbers or metal bars placed athwart the trestletrees at a masthead to spread the shrouds leading to the mast above, or on the head of a lower mast to support the platform or top.
2.
Carpentry. a heavy crossbeam.
Origin
1620-30; cross- + tree
British Dictionary definitions for crosstree

crosstree

/ˈkrɒsˌtriː/
noun
1.
(nautical) either of a pair of wooden or metal braces on the head of a mast to support the topmast, etc