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From The Collaborative International Dictionary of English v.0.48:
Nagana \Na*ga"na\ (n[.a]*g[aum]"n[.a]), n. [Prob. native name.] (Med.) A disease of horses and other domestic animals, transmitted by the tsetse fly; any trypanosomiasis, especially the variety caused by Trypanosoma brucei. [South Africa] [Webster 1913 Suppl.]