Uncertain, but possibly from Proto-Indo-European *welH- (“to turn, wind, roll”), same source as Latin vāllum (“rampart”), North Frisian wal (“wall”), Dutch wal (“wall, rampart, embankment”), German Wall (“rampart, mound, embankment”), Swedish vall (“mound, wall, bank”).^[1]

• vallēs (post-classical)

• (Classical Latin) IPA^(key): /ˈu̯al.lis/, [ˈu̯älːʲɪs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈval.lis/, [ˈvälːis]

vallis f (genitive vallis); third declension

1. (literal) a valley, vale
2. (transferred sense, poetic) a hollow

   Cur valle permutem Sabina divitias operosiores? (Hor, Odes 3, I)

   'Why should I change my Sabine valley, for the heavier burden of excess wealth? ' A. S. Kline

Third-declension noun (i-stem).

• convallis
• vallestria
• vallicula
• Vallōnia

See the etymology of the corresponding lemma form.

• (Classical Latin) IPA^(key): /ˈu̯aːl.liːs/, [ˈu̯äːlːʲiːs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈval.lis/, [ˈvälːis]

vāllīs n

1. dative/ablative plural of vāllum

• “vallis”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• vallis in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.