Louver

Definitions

1. A type of turret on the roof of certain medieval buildings designed to allow ventilation or the admission of light.
2. A series of sloping overlapping slats or boards which admit air and light but exclude rain etc.
   in-plural
3. Any of a system of slits, as in the hood of an automobile, for ventilation.

Equivalents

Examples

“But darknesse dred and daily night did hover / Through all the inner parts, wherein they dwelt; / Ne lightned was with window, nor with lover, / But with continuall candle-light […].”

CEFR level