LATIN DICTIONARYLexicon Latīnum
noun · neutersecond declension

catōnium

catōnium n (genitive catōniī or catōnī)
Classical[kaˈtoː.ni.ũː]Ecclesiastical[kaˈtɔː.ni.um]

Meaning

  1. the underworld

Declension

declension
formsingularplural
nominativecatōniumcatōnia
genitivecatōniī
catōnī		catōniōrum
dativecatōniōcatōniīs
accusativecatōniumcatōnia
ablativecatōniōcatōniīs
vocativecatōniumcatōnia

cătōnĭum, ii, n. κάτω,
I. the Lower World, Laber. ap. Gell. 16, 7, 4; cf. Schol. Juv. p. 65 Cram.—Hence the play upon the word: vereor, ne in catonium Catoninos, Cic. Fam. 7, 25, 1 B. and K. (others read catomum; v. this word).

Origins

From Ancient Greek κάτω (kátō, “below; in the underworld”) + -ium.

Quick answers

What does catōnium mean in Latin?
catōnium, a noun, means “the underworld”.
What is the genitive of catōnium?
The genitive singular is catōniī. catōnium is neuter, second declension.
How do you pronounce catōnium?
In classical Latin, [kaˈtoː.ni.ũː]; in ecclesiastical (church) Latin, [kaˈtɔː.ni.um].