noun
a device used to deflect wind or rain, such as a windbreak or a canopy
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The abat-vent on the roof of the building helps to regulate air flow.
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I always keep the abat-vent open in my car to let in fresh air.
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Make sure to crack the abat-vent when it gets stuffy in here.
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Her laughter was like an abat-vent, filling the room with joy and lightening the mood.