the.com/louvre

means A louvre (lowercase) is a slatted opening or shutter designed to let air through while keeping rain and direct light out.

from The word comes from French louvre, likely connected to Old French lover meaning 'skylight' or 'opening for smoke to escape,' possibly with roots tangled up in Medieval Latin lodarium — itself of uncertain origin, possibly Germanic. The Paris palace took its name separately, likely from the same French word for an opening or lookout, though the palace's own naming is debated — one old (and unreliable) folk tale ties it to a wolf den (louverie), but that's folk etymology, not established fact. The slatted window-shutter sense is the straightforward architectural descendant of the 'opening to let air or smoke pass' meaning.