The Collaborative International Dictionary of English v.0.48:
Soudan \Sou*dan"\, n.[F.] A sultan. [Obs.] [1913 Webster] SoudedWordNet (r) 3.0 (2006):
Soudan n 1: a republic in northeastern Africa on the Red Sea; achieved independence from Egypt and the United Kingdom in 1956 [syn: Sudan, Republic of the Sudan, Soudan] 2: a region of northern Africa to the south of the Sahara and Libyan deserts; extends from the Atlantic to the Red Sea [syn: Sudan, Soudan]