louver
noun
lou·ver ˈlü-vər 
variants or louvre
1
: a roof lantern or turret often with slatted apertures for escape of smoke or admission of light in a medieval building
2
a
: an opening provided with one or more slanted fixed or movable fins to allow flow of air but to exclude rain or sun or to provide privacy
b
: a finned or vaned device for controlling a flow of air or the radiation of light
c
: a fin or shutter of a louver
louvered adjective
or less commonly louvred
ˈlü-vərd
Example Sentences
Recent Examples on the Web Skylights here admit ample light while the stylish vertical louver-board screening enhances privacy while admitting fresh air. 
James Alexander, Hartford Courant, 9 Sep. 2022 This stylish armoire helps hide your excess clutter behind louver detailed doors. Tim Kohut, BGR, 30 June 2021 But Walker said the volunteers had only replaced panels in the louvers. Bob Sandrick, cleveland, 14 Apr. 2020 Redesigned front fenders with louvers increase front downforce while smoothing airflow for greater high-speed stability. Tribune News Service, cleveland, 4 Apr. 2020 There's a familiar AMG grille with vertical louvers, a new front bumper with mouthy black air intakes, flared wheel arches, a rear diffuser, and big rectangular exhaust outlets. Scott Oldham, Car and Driver, 2 Mar. 2020 Cut the foam at least 4 inches larger than the vent and secure it with double-sided tape, or length of wire: From outside, pass the wire around the vent’s louvers, through the foam block, and then twist together the wire ends on the inside. Joseph Truini, Popular Mechanics, 17 Feb. 2020 In 2017, City Club President Terry Toth said club volunteers had replaced missing and/or aging louvers earlier that year. Bob Sandrick, cleveland, 21 Jan. 2020 However, instead of fabric, they're made of hard slats or louvers that tilt to let light in. Jessica Dailey, House Beautiful, 1 Nov. 2019 See More
James Alexander, Hartford Courant, 9 Sep. 2022 This stylish armoire helps hide your excess clutter behind louver detailed doors. Tim Kohut, BGR, 30 June 2021 But Walker said the volunteers had only replaced panels in the louvers. Bob Sandrick, cleveland, 14 Apr. 2020 Redesigned front fenders with louvers increase front downforce while smoothing airflow for greater high-speed stability. Tribune News Service, cleveland, 4 Apr. 2020 There's a familiar AMG grille with vertical louvers, a new front bumper with mouthy black air intakes, flared wheel arches, a rear diffuser, and big rectangular exhaust outlets. Scott Oldham, Car and Driver, 2 Mar. 2020 Cut the foam at least 4 inches larger than the vent and secure it with double-sided tape, or length of wire: From outside, pass the wire around the vent’s louvers, through the foam block, and then twist together the wire ends on the inside. Joseph Truini, Popular Mechanics, 17 Feb. 2020 In 2017, City Club President Terry Toth said club volunteers had replaced missing and/or aging louvers earlier that year. Bob Sandrick, cleveland, 21 Jan. 2020 However, instead of fabric, they're made of hard slats or louvers that tilt to let light in. Jessica Dailey, House Beautiful, 1 Nov. 2019 See More Word History
Etymology
Middle English lover, from Anglo-French
First Known Use
14th century, in the meaning defined at sense 1