TRANSOM

noun the vane of a cross-staff.

2. transom ·noun the piece of wood or iron connecting the cheeks of some gun carriages.

3. transom ·noun one of the crossbeams connecting the side frames of a truck with each other.

4. 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.

5. 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.