Vodka
Russian, diminutive of voda ‘water’.
wiktionary
Borrowed from Russian во́дка(vódka), diminutive of вода́(vodá, “water”). Historical documentary research of V. Pokhlyobkin suggests the derivation via the usage "dilution (of distillate) with water", as used in expressions "vodka of grain wine" and similar; хле́бное вино́(xlébnoje vinó, “grain wine”) is an archaic Russian name for vodka.
The standard of identity is from the Code of Federal Regulations, title 27, section 5.22(a)(1).
etymonline
vodka (n.)
1800, as a Russian word in English, in a description of late 18th century Russian life where it is described as "rectified corn-spirits;" from Russian vodka, literally "little water," diminutive of voda "water" (from PIE *woda-, suffixed form of root *wed- (1) "water; wet") + diminutive suffix -ka.
