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transom

Etymology and origin of the English word transom

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Pronunciation

  • IPA: /ˈtɹæn.səm/[1]

Etymology

It comes from Middle English transyn, traunsom,[2][3][4][5][6] probably an alteration of Latin transtrum (“crossbeam”),[2][3][4] from trāns “across” with an instrumental suffix.[2][3][4] Merriam-Webster and Random House instead take it from Old French traversain “set crosswise”, related to traverse, altered by association with trans-.[5][6]

Earliest recorded meaning

A crossbeam spanning an opening; a lintel (1388 in Barnhart; mid-14th century in Etymonline; 1487–8 in the OED).[3][4][7]

Semantic evolution

By about 1500 the word was used for the horizontal bar of wood or stone across a window,[4][7] and later for the crossbar separating a door from a window above it.[4][7] The small window over a door was a transom from 1844, short for transom window.[3][4][7] It also had technical senses in shipbuilding, for the beams forming a ship's stern,[2][5][6] and in gunnery and carpentry.[4] A manuscript sent over the transom is one submitted unsolicited.[4]

Timeline

  • 1388 – transeyn, a crossbeam or lintel.[3]
  • 1462 – traunsom.[3]
  • 1502 – a horizontal bar across a window.[7]
  • 1615 – the top beam of a gallows.[7]
  • 1844 – a window above a door.[3][7]

Modern meaning

Noun

  1. A horizontal crosspiece over a door, or between a door and a window above it.
  2. A small hinged window above a door or another window.
  3. A horizontal bar of wood or stone dividing a window; a lintel.
  4. Any of the transverse beams fixed to the sternpost of a ship; also the flat stern of a boat.
  5. The horizontal bar of a cross or gallows.

Word family

  • transomed
  • trestle
  • traverse
  • lintel

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d The American Heritage Dictionary of the English Language (1992), 3rd ed., Boston: Houghton Mifflin
  3. ^ a b c d e f g h Barnhart, Robert K., ed. (1995), The Barnhart Concise Dictionary of Etymology, New York: HarperCollins
  4. ^ a b c d e f g h i Harper, Douglas, Online Etymology Dictionary, https://www.etymonline.com
  5. ^ a b c Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster
  6. ^ a b c Random House Webster's Unabridged Dictionary (1999), 2nd ed., New York: Random House
  7. ^ a b c d e f g Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
Cite this entry

“Transom.” Etymologically, 11 Oct. 2026, etymologically.com/en/transom. Accessed 11 Oct. 2026.

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