Atransom is the aft transverse surface of the hull of someboats and ships forming itsstern. Adding both strength and width to the stern, a transom may be flat or curved, and vertical, raked aft (known as an overhung or "counter" stern), or raked forward (and "reversed",[1] also known asretroussé).[2] In small boats and yachts, a flat termination of the stern is typically above thewaterline, but large commercial vessels often exhibit vertical transoms that dip slightly beneath the water.[3]
On smaller boats such as dinghies, transoms may be used to support arudder,outboard motor, or other accessory. On some yachts the transom may include a hinged swim platform, and alazarette for deck items and leisure toys.[4]
The term was used as far back asMiddle English in the 1300s, having come fromLatintransversus (transverse) viaOld Frenchtraversain (set crosswise).[2][5]
![[icon]](/mt/?noimg=&dark=on&url=http%3a%2f%2fen.wikipedia.org%2fwiki%2fFile%3aWiki_letter_w_cropped.svg) | This sectionneeds expansion with: content on the evolution of the transom over time. You can help byadding to it.(August 2025) |
| This sectionneeds expansion with: the advantages and disadvantages of transoms, and the pros and cons of each design. You can help byadding to it.(August 2025) |
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