Definition of "transom"

(architecture) A crosspiece over a door; a lintel.  examples

(architecture) A horizontal glazing bar in a window.  examples

A transom window.  examples

(nautical) Any of several transverse structural members in a ship, especially at the stern; a thwart.  examples

(nautical) The flat or nearly flat stern of a boat or ship.a ship's transom (flat stern)  examples

The horizontal beam on a cross or gallows.  examples

(figuratively, usually attributively) Items that have arrived over the transom.  examples