Webster's English Dictionary

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transom

tran.som \'tran(t)-s*m\ n [ME traunsom, prob. fr. L transtrum, fr. trans 
   across - mor]e at THROUGH 1: a transverse piece in a structure : CROSSPIECE 
   : as  1a: LINTEL  1b: a horizontal crossbar in a window, over a door, or 
   between a door and a  window or fanlight above it 1c: the horizontal bar or 
   member of a cross or gallows  1d: any of several transverse timbers or 
   beams secured to the sternpost of  a boat 2: a window above a door or other 
   window built on and commonly hinged to a  transom