Sonus

From Ancient Greek Σῶνος (Sônos).

• (Classical Latin) IPA^(key): [ˈsɔ.nʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈsɔː.nus]

Sōnus m sg (genitive Sōnī); second declension

1. A tributary river of the Ganges, now the Son River

Second-declension noun, singular only.

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