Proto-MSA

*γadVw- - depression between mountains, mountain pass (Kogan 2015:555)

The origin is unknown.

Mehri
γədə́ww - crack, depression on a mountain (ML 133)
Jibbali
γádɔ́ˀ - depression on a mountain (JL 83)
Soqotri
ˁádho - mountain pass (LS 299; CSOL II 402)