LATIN DICTIONARYLexicon Latīnum
proper noun · masculinethird declension

Silis

Silis m sg (genitive Silis)
Classical[ˈsɪ.lɪs]Ecclesiastical[ˈsiː.lis]

Meaning

  1. masculinesingularA river of Venetia that flows into the Adriatic Sea near Altinum, now the Sile

Declension

declension
formsingularplural
nominativeSilis—
genitiveSilis—
dativeSilī—
accusativeSilem—
ablativeSile—
vocativeSilis—

Silis, is, m.,
I. the name of several rivers.
1. I. q. Jaxartes, Plin. 6, 16, 18, § 49.—
2. I. q. Tanais, the Don, Plin. 6, 7, 7, § 20.—
3. A river in the Venetian territories, Plin. 3, 18, 22, § 126.

Origins

Along with the river Silarus, from a zero-grade form of Proto-Indo-European *seil-, extension of *sei- (“to be damp, drip”), related to Old Saxon sioloth (“lake”), Old Irish silid (“he flows”).

In the Academy Smith's classical dictionaries

Quick answers

What does Silis mean in Latin?
Silis, a proper noun, means “A river of Venetia that flows into the Adriatic Sea near Altinum, now the Sile”.
What is the genitive of Silis?
The genitive singular is Silis. Silis is masculine, third declension.
How do you pronounce Silis?
In classical Latin, [ˈsɪ.lɪs]; in ecclesiastical (church) Latin, [ˈsiː.lis].