Transom

·noun The vane of a cross-staff.

II. Transom ·noun The piece of wood or iron connecting the cheeks of some gun carriages.

III. Transom ·noun One of the crossbeams connecting the side frames of a truck with each other.

IV. Transom ·noun One of the principal transverse timbers of the stern, bolted to the sternpost and giving shape to the stern structure;

— called also transsummer.

V. Transom ·noun A horizontal crossbar in a window, over a door, or between a door and a window above it. Transom is the horizontal, as mullion is the vertical, bar across an opening. ·see ·Illust. of Mullion.