Liris

Probably from a zero-grade extension *li-ro- of Proto-Indo-European *(s)lei- (“slime, slimy, sticky”) (see also English slime (noun)). DNGI instead suggests a derivation from a pre-Roman hydronym *liri- (“muddy water”).[1]

• (Classical) IPA^(key): /ˈliː.ris/, [ˈlʲiːrɪs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈli.ris/, [ˈliːris]

The river's waterfalls

Līris m sg (genitive Līris); third declension

1. A major river in Latium, Italy, now the Liri

Third-declension noun (i-stem, accusative singular in -im, -in or -em, ablative singular in -ī), singular only.

• Italian: Liri

• “Liris”, in William Smith, editor (1854, 1857), A Dictionary of Greek and Roman Geography, volume 1 & 2, London: Walton and Maberly
• Liris in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.