/'trænsəm; `trænsəm/
n
1 horizontal bar of wood, stone, etc across the top of a door or window （门窗上端的）横楣, 横档. =>illus at App
1 见附录1插图, page viii.
2 (esp US) window above the transom of a door or of a larger window; fanlight （门或大窗户横楣上方的）气窗, 顶窗, 扇形窗.

n[C]
[Date: 1300-1400; Origin: Probably from Latin transtrum, from trans 'across']
a bar of wood that forms the top of the back part of a boat
a bar of wood or stone which separates a door from a window above it, or which divides a window into two parts
AmE a small window over a door or over a larger window
British Equivalent: fanlight