Katabatic definitions

kăt'ə-băt'ĭk
Of or relating to the downward flow of cold dense air.

A katabatic wind.

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Moving downward.
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Relating to wind currents that blow down a gradient, especially down the slopes of a mountain or glacier. When air comes in contact with the cool surface of a glacier or the upper regions of a mountain or slope, the air cools, becomes dense, and blows downward. Katabatic winds are usually cool and are especially common at night in polar regions.
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(meteorology, of airflow) Downslope on a mountainside.
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Origin of katabatic

Greek katabatikos pertaining to descent from katabatos descending kata- cata- batos going gwā- in Indo-European roots