What does "dongola" mean?

Dongola: Dongola kid. Dongola kid, D. leather, leather made by the Dongola process. -- D. process, a process of tanning goatskin, and now also calfskin and sheepskin, with a combination of vegetable and mineral agents, so that it resembles kid. -- D. race, a boat race in which the crews are composed of a number of pairs, usually of men and women.