transom
UK: ˈtrænsəm | US: ˈtrænsəm
n. a horizontal crossbar in a window, door, or other structure
n. (nautical) a flat surface at the stern of a vessel
n. (archaic) a small window above a door or another window
The word "transom" originates from Middle English traunsom, derived from Old French traversin (crossbeam), which itself comes from Latin transversum (something lying across). The morpheme "trans-" (across) is preserved from Latin, while "-om" evolved from the Latin suffix "-versum" (turned). Over time, the term narrowed to specifically refer to crossbeams in windows or ships, reflecting its functional role in dividing or supporting structures.
Light streamed through the transom above the office door.
The boat’s transom was reinforced to support the outboard motor.
He peeked through the transom to see if the room was occupied.
The architect designed a decorative transom to enhance the entryway.
Water leaked where the transom met the window frame.