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dormer (noun) a vertical window standing above a sloping roof.
A window built straight up in a roof for better ventilation is a dormer or a dormer window. Dormers are usually provided for better ventilation in the attics under the roof.
- The dormer windows rising above the slanting roof really give the building an impressive appearance.
- Dormers were not shown in the plan of the building, but were later provided for better ventilation and also because the owner felt that without them, the roof might look bald.