A city in central Sudan, on the River Nile opposite Khartoum; population 3,151,600 (est. 2007). In 1898 it was the site of a battle which marked the final British defeat of the Mahdist forces.
Definition of Omdurman in US English:
Omdurman
proper nounˌɑmdərˈmɑnˌämdərˈmän
A city in central Sudan, on the Nile River opposite Khartoum; population 3,151,600 (est. 2007).