Definition of: transom

(tran′səm) noun
1. A horizontal piece framed across an opening; a lintel.
2. A window above such a bar, especially a small window above a door.
3. A horizontal construction dividing a window into stages.
4. A tie beam.
5. Naut. A beam running across and forming part of the stern frame of a ship.
6. The horizontal crossbar of a gallows or cross. [<L transtrum a crossbeam <trans across]
—tran′somed adjective