tran ‧ som /ˈtræns ə m/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Origin: Probably from Latin transtrum , from trans 'across' ]
1 . a bar of wood that forms the top of the back part of a boat
2 . 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 English a small window over a door or over a larger window SYN fanlight British English