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3 definitions found
 for transom
From The Collaborative International Dictionary of English v.0.48 :

  Transom \Tran"som\, n. [Probably fr. L. transtrum a crossbeam,
     transom, from trans across. Cf. Trestle.]
     1. (Arch.) A horizontal crossbar in a window, over a door, or
        between a door and a window above it. Transom is the
        horizontal, as mullion is the vertical, bar across an
        opening. See Illust. of Mullion.
        [1913 Webster]
  
     2. (Naut.) One of the principal transverse timbers of the
        stern, bolted to the sternpost and giving shape to the
        stern structure; -- called also transsummer.
        [1913 Webster]
  
     3. (Gun.) The piece of wood or iron connecting the cheeks of
        some gun carriages.
        [1913 Webster]
  
     4. (Surg.) The vane of a cross-staff. --Chambers.
        [1913 Webster]
  
     5. (Railroad) One of the crossbeams connecting the side
        frames of a truck with each other.
        [1913 Webster]
  
     Transom knees (Shipbuilding), knees bolted to the transoms
        and after timbers.
  
     Transom window. (Arch.)
        (a) A window divided horizontally by a transom or
            transoms.
        (b) A window over a door, with a transom between.
            [1913 Webster]

From WordNet (r) 3.0 (2006) :

  transom
      n 1: a window above a door that is usually hinged to a
           horizontal crosspiece over the door [syn: transom,
           transom window, fanlight]
      2: a horizontal crosspiece across a window or separating a door
         from a window over it [syn: transom, traverse]

From Moby Thesaurus II by Grady Ward, 1.0 :

  60 Moby Thesaurus words for "transom":
     air duct, air hole, air passage, air shaft, air tube, airway, bay,
     bay window, blowhole, bow window, breathing hole, casement,
     casement window, cross bitt, crossarm, crossbar, crosspiece,
     doubletree, fan window, fanlight, grille, lancet window, lantern,
     lattice, light, louver, louver window, louverwork, naris, nostril,
     oriel, pane, picture window, port, porthole, rose window, shaft,
     singletree, skylight, spilehole, spiracle, swingletree, touchhole,
     transept, transversal, transverse, traverse, vent, ventage,
     venthole, ventiduct, ventilating shaft, ventilator, whippletree,
     wicket, wind tunnel, window, window bay, window glass,
     windowpane
  
  

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