Webster's English Dictionary

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wadi

wa.di \'wa:d-e-\ n [Ar wa-diy] 1: the bed or valley of a stream in regions 
   of southwestern Asia and northe rn Africa that is usu. dry except during 
   the rainy season and that often forms an oasis : GULLY, WASH 2: a shallow 
   usu. sharply defined depression in a desert region