1939 . [ see Nilo-] 
1954 Pei & Gaynor Dict. Linguistics 207Some linguists consider Sudanese and Guinean as two independent families; others, notably Delafosse, consider Sudano-Guinean and Bantu to be members of a larger linguistic group. 
1979 Nature 18 Jan. 167/3 UNCOD therefore proposed giant transnational projects like..a joint livestock management programme in the Sudano-Sahelian countries. 
ORIGIN: formed as Sudan -o-