Proto-Baltic: *wan̂d-ō̃ (-en-es) (2), *un̂d-ō̃ (-en-es) (2), *und-a- n., *und-[a]- m.
Meaning: water
Lithuanian: vanduõ, gen. -eñs, acc. vándenį `Wasser', dial. unduõ, únduo `Wasser'
Lettish: ûdens (gen. -ns/-n̨a), ûdęns2, ûdins 'Wassser'
Old Prussian: wundan n., unds m. 'Wasser'