Definition of louver
1 : a roof lantern or turret often with slatted apertures for escape of smoke or admission of light in a medieval building
2a : 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 privacyb : a finned or vaned device for controlling a flow of air or the radiation of lightc : a fin or shutter of a louver
louveredor less commonly
louvredplay \ˈlü-vərd\ adjective
Recent Examples of louver from the Web
Aston Martin added extraction louvers above the front wheel arches to reduce air pressure and lift, and pairs of carbon-fiber dive planes create additional front-end downforce.
An active front grille with louvers that close at highway speed to enhance aerodynamic and open at low speed to provide maximum cooling to the fuel cell stack.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'louver'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of louver
Middle English lover, from Anglo-French
First Known Use: 14th centurySee Words from the same year
LOUVER Defined for English Language Learners
Definition of louver for English Language Learners
: an opening in a door or window that has one or more slanted strips to allow air to flow in and out while keeping out rain and sun
: one of the slanted strips of a louver
Seen and Heard
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