dormer

Noun

WordNet 3.0

Noun (1)

a gabled extension built out from a sloping roof to accommodate a vertical windowSynonyms: dormer window

Webster's Dictionary (GCIDE)

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. [1913 Webster]

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. Dormer