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Date: 1300-1400
Origin: Probably from Latin transtrum, from trans 'across'

transom

noun
     
Related topics: Buildings
tran‧som [countable]
1 a bar of wood that forms the top of the back part of a boat
2TBB a bar of wood or stone which separates a door from a window above it, or which divides a window into two parts
3 American EnglishTBB a small window over a door or over a larger window [= fanlight British English]

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