noun, Pathology. 1. the accumulation of excessive ketones in the body, as in diabetic acidosis. Origin of ketosis. 1915-1920.
Climate zones of Africa, showing the ecological break between the hot desert climate of the Sahara Desert (red), the hot semi-arid climate of the Sahel (orange) and the tropical climate of Central and Western Africa (blue).
The Sahara Desert covers most of North Africa. The Sahara Desert is  the largest subtropical hot desert and third largest desert in the  world, after Antarctica and the Arct â¦ ic. The largest desert in the world is Antarctica which is not in  northern Africa.