adjective Meteorology.
(of a wind or air current) moving downward or down a slope. Compare anabatic ( def 1 ).

1915–20; < Greek katabatikós pertaining to going down, equivalent to kata- kata- + ba- (stem of baínein to go; see basis) + -tikos -tic

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World English Dictionary
katabatic (ˌkætəˈbætɪk)
Compare anabatic (of winds) blowing downhill through having become denser with cooling, esp at night when heat is lost from the earth's surface

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
katabatic   (kāt'ə-bāt'ĭk)  Pronunciation Key 
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. Compare anabatic.
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Example sentences
The velocity of katabatic winds can be intensified by large and small-scale pressure gradients.
Latent heat polynyas are maintained by persistent katabatic winds that drain off the continent.
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