Nautical (plural) Two horizontal cross-timbers supported by the cheeks and trestle-trees at the head of the lower and top masts, to sustain the…

Something insignificant, or smaller than the normal size. Nautical. Short for jackcrosstree, n. Now historical and rare.

Either of the highest pair of crosstrees (cross-tree, n. 1) on a ship, supporting the jackstaff and often used as a lookout. Also: either of a pair…