LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Portūnus

Portūnus m sg (genitive Portūnī)
Classical[pɔrˈtuː.nʊs]Ecclesiastical[porˈtuː.nus]

Meaning

  1. a minor Roman god, protector of harbors, also called Palaemon

Declension

declension
formsingularplural
nominativePortūnus—
genitivePortūnī—
dativePortūnō—
accusativePortūnum—
ablativePortūnō—
vocativePortūne—

Portūnus (less correctly Portum-nus), i, m. portus,
I. the protecting god of harbors, also called Palaemon, Cic. N. D. 2, 26, 66; Ov. F. 6, 547; Verg. A. 5, 241 Serv.; Lact. 1, 21, 23; Inscr. Orell. 1585; Paul. ex Fest. p. 243.—Hence,
II. Portūnālis (Portumn-), e, adj., of or belonging to Portunus, Portunal: flamen, Poët. ap. Fest. s. v. persillum, p. 217 Müll.—
2. Subst.: Portūnālĭa, ĭum, n., the festival of Portunus, celebrated annually on the 17th of August, Varr. L. L. 6, § 19 Müll.; Calend. ap. Inscr. Orell. 2, p. 396.

Origins

From *portūnus (as seen in opportūnus and importūnus), from portus (“port, harbour”) + -nus (see -īnus). Compare lacūna.

In the Academy Smith's classical dictionaries

Biography & mythologyPortunusPortunus. or PORTUMNUS, the protecting genius of harbours among the Romans. He was invoked to grant a happy return from a voyage. Hence a temple was e…

Quick answers

What does Portūnus mean in Latin?
Portūnus, a proper noun, means “a minor Roman god, protector of harbors, also called Palaemon”.
What is the genitive of Portūnus?
The genitive singular is Portūnī. Portūnus is masculine, second declension.
How do you pronounce Portūnus?
In classical Latin, [pɔrˈtuː.nʊs]; in ecclesiastical (church) Latin, [porˈtuː.nus].