noun
dormer
DOR-mer/ˈdɔrmər/
A roofed projection from a sloping roof, usually containing a window.
A small dormer projects from the steep roof above the porch.

Etymology
The ‘sleeping room’ connection is architectural: these projecting windows were chiefly found in upper bedrooms. A name for the room thus came to name its roof window.
In context
we are proposing a shed dormer right there
More examples
- Two dormers give the attic more headroom and natural light.
- The contractor repairs the flashing around the dormer.
- Each dormer has a window overlooking the street.
Forms
dormer · dormers
Similar words
- dormer window
- Often names the window itself rather than the surrounding projection.