GRC

πόρθμιον

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LSJ

freq. f.l. for πορθμεῖον, e.g. Luc. Luct. 10.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)

Pape

τό, = πορθμεῖον, Plut. exil. 11.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)
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