a crosspiece separating a door or the like from a window or fanlight above it.
Also called transom light, transom window. a window above such a crosspiece.
a crossbar of wood or stone, dividing a window horizontally.
a window so divided.
a flat termination to a stern, above the water line.
framework running athwartships in way of the sternpost of a steel or iron vessel, used as a support for the frames of the counter.
Artillery. a metal piece connecting the sidepieces of the tail or the cheeks of a gun carriage.

1325–75; late Middle English traunsum, traunsom, Middle English transyn, probably alteration (by association with trans-) of traversayn < Old French traversin crosspiece, derivative of travers breadth; see traverse

transomed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
transom (ˈtrænsəm)
1.  Compare mullion Also called: traverse a horizontal member across a window
2.  a horizontal member that separates a door from a window over it
3.  the usual US name for fanlight
4.  nautical
 a.  a surface forming the stern of a vessel, either vertical or canted either forwards (reverse transom) or aft at the upper side
 b.  any of several transverse beams used for strengthening the stern of a vessel
[C14: earlier traversayn, from Old French traversin, from traverse]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1388, transeyn "crossbeam spanning an opening, lintel," probably by dissimilation from L. transtrum "crossbeam" (especially one spanning an opening), from trans- "across" + instrumental suffix -trum. Meaning "small window over a door or other window" is first recorded 1844.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
No, it doesn't prove that, because sequences can come in over the transom
  through the trans-genic route.
The rectangular transom above the door to the street shone a dazzling white
Meanwhile, a few things have come across the transom.
Awesome family room with transom windows leading to an oversized deck.
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