Definitions
1.nounA crosspiece over a door; a lintel.
2.nounA horizontal dividing bar in a window.
3.nounA transom window.
4.nounAny of several transverse structural members in a ship, especially at the stern; a thwart.
5.nounThe flat or nearly flat stern of a boat or ship.
6.nounThe horizontal beam on a cross or gallows.
7.noun(usually attributively) Items that have arrived over the transom."They only met the deadline by working most of the night and making a transom filing."