LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Crustumius

Crustumius m sg (genitive Crustumiī or Crustumī)
Classical[krʊsˈtʊ.mi.ʊs]Ecclesiastical[krusˈtuː.mi.us]

Meaning

  1. masculinesingularA river of Umbria flowing into the Adriatic Sea between Ariminum and Pisaurum, now the river Conca

Declension

declension
formsingularplural
nominativeCrustumius—
genitiveCrustumiī
Crustumī		—
dativeCrustumiō—
accusativeCrustumium—
ablativeCrustumiō—
vocativeCrustumī—

In the Academy Smith's classical dictionaries

GeographyCrustumiusCrustumius a river of Umbria, flowing into the Adriatic Sea between Ariminum and Pisaurum. It is noticed by Pliny as in the vicinity of Ariminum, but …

Quick answers

What does Crustumius mean in Latin?
Crustumius, a proper noun, means “A river of Umbria flowing into the Adriatic Sea between Ariminum and Pisaurum, now the river Conca”.
What is the genitive of Crustumius?
The genitive singular is Crustumiī. Crustumius is masculine, second declension.
How do you pronounce Crustumius?
In classical Latin, [krʊsˈtʊ.mi.ʊs]; in ecclesiastical (church) Latin, [krusˈtuː.mi.us].