Slavic dragon
In Slavic mythology, the word “zmey” (Bulgarian and Russian: змей, Macedonian: змеj) and its cognates zmiy (Polish: żmij, Ukrainian: змій) and zmaj (Serbian: змај, Croatian, Slovene: zmaj), are used to describe a dragon. These words are masculine forms of the Slavic word for "snake", which are normally feminine (like Russian zmeya).
In Romania, there is a similar figure, derived from the Slavic dragon and named zmeu. In Polish and Belarusian folklore, as well as in the other Slavic folklore, a dragon is also called smok (смок, цмок, smok).
In South Slavic folklore, the female variation is also called lamya (derived from lamia). Although quite similar to other European dragons, Slavic dragons have their peculiarities.
East Slavic
In Russia and Ukraine, a particular dragon-like creature, Zmey Gorynych (Russian: “змей Горыныч” or Ukrainian: “змій Горинич”), has three heads, is green, walks on two back paws, has small front paws, and spits fire. According to one bylina, Zmey Gorynych was the dragon killed by Dobrynya Nikitich.