n. One of the cross-ties or sleepers laid under the longitudinal sills of a permanent way for a street railway, or for any railway laid on this system, as in a mine.n. In architecture, a horizontal bar of timber or stone across a window; also, the cross-bar separating a door from the fanlight above it. See mullion.n. Same as transom-window, 2.n. A slat of a bedstead.n. Nautical, one of several beams or timbers fixed across the stern-post of a ship to strengthen the after part and give it the figure most suitable to the service for which the vessel is intended. See also cut under counter.n. In a saw-pit, a joist resting transversely upon the strakes.n. One of two beams of wood or metal secured horizontally to the side frames of a railway car-truck. They are placed one on each side of the swing-bolster.n. In gunnery, a piece of wood or iron joining the cheeks of gun-carriages, whence the terms transom-plates, transom-bolts, etc.n. In surveying, a piece of wood made to slide upon a cross-staff; the vane of a cross-staff.