half-moon window

noun
UK /ˌhɑːfˈmuːn ˈwɪndəʊ/
US /ˌhæfˈmun ˈwɪndoʊ/

A half-moon window is a window shaped like a half circle.

Sunlight came through the half-moon window above the door.


OTHER MEANINGS

2. A small semicircular window set above a door or larger window to let in light.

The old house had a half-moon window over the front door.

3. A decorative semicircular opening or panel in a wall or ceiling.

A half-moon window in the ceiling brightened the hallway.

4. A window with a curved top that echoes the shape of the moon.

From outside, the half-moon window looked like a smiling eye.