n. 屋顶采光窗(天窗)

[ noun ]
a gabled extension built out from a sloping roof to accommodate a vertical window
<noun.artifact>

Dormer \Dor"mer\, or Dormer window \Dor"mer win"dow\, n.
[Literally, the window of a sleeping apartment. F. dormir to
sleep. See {Dormant}, a. & 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.

Dormant \Dor"mant\, n. [See {Dormant}, a.] (Arch.)
A large beam in the roof of a house upon which portions of
the other timbers rest or `` sleep.'' --Arch. Pub. Soc. --
Called also {dormant tree}, {dorman tree}, {dormond}, and
{dormer}. --Halliwell.