προστόμιον
From LSJ
δόξειε δ' ἂν τῆς κυριωτάτης καὶ μάλιστα ἀρχιτεκτονικῆς. τοιαύτη δ' ἡ πολιτικὴ φαίνεται → It would seem to belong to the most authoritative art and that which is most truly the master art. And politics appears to be of this nature.
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.