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 

Examples of louver in a Sentence

Recent Examples on the Web

On the front of the unit are four-way louvers to direct airflow and an onboard control panel with eight buttons and a display. —PC Magazine, 26 Aug. 2025

Look for louvers that can move both up and down as well as side to side. —Lisa Wood Shapiro, Wired News, 26 Aug. 2025

Every aerodynamic surface has been revised, including a larger front splitter and new fender louvers, both of which come as part of the Evolution aero package, which also includes suspension adjustments and comfort improvements. —New Atlas, 19 Aug. 2025

The front fenders now feature louver vents and revised underbody aerodynamic engineering to improve overall precision on track, especially at high speed. —Peter Nelson, Forbes.com, 14 Aug. 2025

Word History

Etymology

Middle English lover, from Anglo-French

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for louver

• mover
• approver
• improver
• maneuver
• remover

Kids Definition

louver

noun

lou·​ver

variants or louvre

ˈlü-vər 

1

: an opening provided with one or more slanted strips to allow flow of air or light but to exclude rain or sun or to provide privacy

2

: one of the slanted strips of a louver

louvered

-vərd

adjective