dor·mer /ˈdɔrmɚ/
  (屋頂斜坡上凸出之)天窗,老虎窗
  Dor·mer or Dor·mer win·dow, n.  Arch. A window pierced in a roof, and so set as to be vertical while the roof slopes away from it. Also, the gablet, or houselike structure, in which it is contained.
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  dormer
       n : a gabled extension built out from a sloping roof to
           accommodate a vertical window [syn: dormer window]