LATIN DICTIONARYLexicon Latīnum
proper noun · neutersecond declension

Icosium

Icosium n sg (genitive Icosiī or Icosī)
Classical[ɪˈkɔ.si.ũː]Ecclesiastical[iˈkɔː.s̬i.um]

Meaning

  1. neutersingularA city on the coast of Algeria, Roman Mauretania Caesariensis, now contained by the qaṣaba of Algiers

Declension

declension
formsingularplural
nominativeIcosium—
genitiveIcosiī
Icosī		—
dativeIcosiō—
accusativeIcosium—
ablativeIcosiō—
vocativeIcosium—
locativeIcosiī—

Origins

Borrowed from Ancient Greek Ἰκόσιον (Ikósion), from Punic 𐤀𐤉𐤊𐤎𐤌 (ʾyksm).

In the Academy Smith's classical dictionaries

GeographyIcosiumIcosium (Ἰκόσιον: Algier), a city on the coast of Mauretania Caesariensis, E. of Caesarea, a colony under the Roman empire, and presented by Vespasian…

Quick answers

What does Icosium mean in Latin?
Icosium, a proper noun, means “A city on the coast of Algeria, Roman Mauretania Caesariensis, now contained by the qaṣaba of Algiers”.
What is the genitive of Icosium?
The genitive singular is Icosiī. Icosium is neuter, second declension.
How do you pronounce Icosium?
In classical Latin, [ɪˈkɔ.si.ũː]; in ecclesiastical (church) Latin, [iˈkɔː.s̬i.um].