LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Porthmus

Porthmus m sg (genitive Porthmī)
Classical[ˈpɔrtʰ.mʊs]Ecclesiastical[ˈpɔrt.mus]

Meaning

  1. masculinesingularA harbour of Euboea situated opposite to Rhamnus

Declension

declension
formsingularplural
nominativePorthmus—
genitivePorthmī—
dativePorthmō—
accusativePorthmum—
ablativePorthmō—
vocativePorthme—
locativePorthmī—

Origins

Borrowed from Ancient Greek Πορθμός (Porthmós).

In the Academy Smith's classical dictionaries

GeographyPorthmusPorthmus (Πόρθμος), a harbour in Euboea, belonging to Eretria, described by Demosthenes as opposite to Attica, is the modern Porto Búfalo, immediately…

Quick answers

What does Porthmus mean in Latin?
Porthmus, a proper noun, means “A harbour of Euboea situated opposite to Rhamnus”.
What is the genitive of Porthmus?
The genitive singular is Porthmī. Porthmus is masculine, second declension.
How do you pronounce Porthmus?
In classical Latin, [ˈpɔrtʰ.mʊs]; in ecclesiastical (church) Latin, [ˈpɔrt.mus].