A katabatic wind (named from the Greek word κατάβασις katabasis, meaning "descending") is a drainage wind, a wind that carries high-density air from a higher elevation down a slope under the force of gravity.

What does the word katabatic mean?

: relating to or being a wind produced by the flow of cold dense air down a slope (as of a mountain or glacier) in an area subject to radiational cooling.

What makes katabatic winds?

Also known as fall winds, katabatic winds are usually caused by gravity pulling higher density air downslope to lower density air.