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dormer (n.)

also dormer-window, "window standing vertically in a projection built out to receive it from a sloping roof," 1590s, from French dormeor "sleeping room," from dormir "to sleep," from Latin dormire (see dormant). So called because they were chiefly in upper bedrooms.

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Definitions of dormer from WordNet

dormer (n.)
a gabled extension built out from a sloping roof to accommodate a vertical window;
Synonyms: dormer window
From wordnet.princeton.edu