Lewis Short
Astăpus | Astusă-pes, ae | Astăpē | Astŏsabas (noun M.m) : Ἀστάπους
* The name of the Nile as it flows through Ethiopia: (Nilus) medios Aethiopas secat cognominatus Astapus, quod illarum gentium linguā significat aquam e tenebris profluentem,Plin. 5, 9, 10, § 53.—Also called , Plin. 5, 9, 10, § 53 fin. (in Mel. 1, 9, 2, ; in Vitr. 8, 2, 6, , , , = Ἀστοσάβας, Strab.; cf. Mann. Afr. I. 170; acc. to others, a river of Ethiopia falling into the Nile, now called Abai).
Charlton T. Lewis, Charles Short, A Latin Dictionary