στειναύχην
From LSJ
ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
English (LSJ)
ενος, ὁ, ἡ,
A narrow-necked, Ion. for στεν-, λάγυνος AP 6.248 (Marc. Arg.).
German (Pape)
[Seite 933] ενος, ion. = στεναύχην, enghalsig, von einer Flasche, M. Arg. 21 (VI, 248).
Greek (Liddell-Scott)
στειναύχην: -ενος, ὁ, ἡ, ὁ ἔχων στενὸν αὐχένα, λαιμόν, Ἰων. ἀντὶ στεν-, λάγυνος Ἀνθ. Π. 6. 248.