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

Here, those louvers help extract heat from the engine bay. —Lawrence Ulrich, Robb Report, 25 June 2025

The frame, louvers, and base are constructed from premium aluminum material designed to resist rust, peeling, fading, and corrosion. —Jacqueline Tempera, People.com, 22 June 2025

This will feature lots of natural light thanks to the skylights already mentioned, plus a transparent facade made up of aluminum and glass, with glazed louvers. —Adam Williams, New Atlas, 27 Feb. 2025

Kurtz said the family already had invested in automation that watered plants on timers and opened greenhouse louvers, allowing greater circulation based on inputs from an on-site weather station that measurers sunlight, temperature and humidity. —Mark Pazniokas, Hartford Courant, 23 Apr. 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