LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Arnus

Arnus m sg (genitive Arnī)
Classical[ˈar.nʊs]Ecclesiastical[ˈar.nus]

Meaning

  1. masculinesingularArno (a river in Tuscany)

Declension

declension
formsingularplural
nominativeArnus—
genitiveArnī—
dativeArnō—
accusativeArnum—
ablativeArnō—
vocativeArne—

Arnus, i, m., = Ἄρνος,
I. a river of Etruria, now the Arno, Plin. 3, 5, 8, § 50; Tac. A. 1, 79 al.; cf. Mann. Ital. I. 328.—Hence, Arnĭensis, e, adj., of or pertaining to the Arnus: tribus, situated on the Arnus, acc. to Liv. 6, 5, settled A. U. C. 396, most distant from Rome, as Saburana was the nearest: a Saburană usque ad Arniensem, Cic. Agr. 2, 29.

In the Academy Smith's classical dictionaries

GeographyArnusArnus (Ἄρνος: Arno), the principal river of Tuscany, and next to the Tiber the most considerable river of Central Italy. Strabo describes it as flowin…

Quick answers

What does Arnus mean in Latin?
Arnus, a proper noun, means “Arno (a river in Tuscany)”.
What is the genitive of Arnus?
The genitive singular is Arnī. Arnus is masculine, second declension.
How do you pronounce Arnus?
In classical Latin, [ˈar.nʊs]; in ecclesiastical (church) Latin, [ˈar.nus].