fenestra rotunda
fenestra cochleae
round window
fenestra of the cochlea

The only light in here came through the small round windows, and we could hardly see each other.

The stage below, marking the limit of building in 1684, had round windows.

The rear of the blocks also included large round windows.

There was a large, round window about eight feet up.

Sasha walked up and looked in one of the small round windows.

What he saw through those round windows was even worse.

This late at night they couldn't see the moon through the round windows of the room.

She looked around very cautiously, her eyes filling with the white light coming through the round windows.

The room was dark; the small round windows admitted no light.

It was very big with curved walls and round windows.