noun
also wa·dy or wad·dy ˈwädē, -di ; or oued ˈwed
( plural wadis also wadies or waddies or oueds )
Etymology: Arabic wādiy
1. : the bed or valley of a stream in arid regions of southwestern Asia and northern Africa that is usually dry except during the rainy season and that often forms an oasis : gully , ravine , wash
2. : a shallow usually sharply defined depression in a desert region of poorly developed drainage in southwestern Asia and northern Africa