Proto-Indo-European Roots

Root/Stem:	*wed- / *wod-, *wed-r-
Meanings:	wet, water
Cognates:	Greek udwr (water)
	Latin unda (a wave) - a nasal consonant was infixed Umbrian utur, abl. une (water)
	Common Celtic *ud-s-kio- (water) - the suffixed zero-grade of the word *ved-;  > Old Irish usce - -d- was completely lost;  Irish uisce, Scottish uisge
	Common Germanic *wadar (water) - *-d- soon became *-t- according to common Germanic shifts;  > Gothic wató, Old English waeter, Old Norse vatn, vatr, Old Frankish weter, Old Swedish watar, Frisian wa"ter, Old High German wazzar
	Hittite wetenas' (water), watar (gen.sg. of water) - mutations in nom. sg.
	Sanskrit udan, udaka (water)
	Thracian utus (a river);  > Albanian uj (water) - a simple stem with a mutated *-d-
	Phrygian bedu- (water), Armenian get (a river) - we do not know the exact ties but they are related
	Old Baltic *vand- (water) - an infix like in Latin; maybe the Proto-vowel was nasal?;  > Old Prussian wundan (water), Lithuanian vanduo (water), vandens (gen.sg. of water), Zemaitian unduo, Latvian udens
	Common Slavic *woda - *-a- became *-o- in Slavic; the word went into a-stems  > Russian Ukrainian Belarussian Bulgarian Serbo-Croatian Slovenian Chekh Slovak Polish Sorbian woda
Notes:	The noun was sooner masculine than feminine or neuter; but we still doubt even to which stems it belonged in Proto-Indo-European. Look for yourself: in Germanic it is neuter and a-stem; in Baltic it is masculine and n-stem; in Slavic it is feminine and a-stem.  But the stem was strong enough to appear in majority of modern and ancient languages, sometimes even in several forms (stem or suffixed). The very stem meant just "something wet", but suffixes *-r-, *-n- and other made it a noun "water".  English still keeps words water, wet, some derivatives.  German is conservative and has preserved Wasser, the old High German form.  French has taken another stem for "water", but preserved from the Latin for "wave" onde (f).