προστόμιον

English (LSJ)

τό,

   A mouth, esp. of a river, A.Supp.3 (anap., pl.).    II joining of the lips, Ruf.Onom.41, Poll.2.90.

German (Pape)

[Seite 783] τό, die Mündung, Νείλου, Aesch. Suppl. 3.