Yes, that is the original Russian word. Not dasvidanya or dasvidaniya or any of the words that the similar-sounding Bollywood film indirectly promoted. The word literally means "till we meet again..!" and not "good-bye" as is wrongly believed.
The word has its origins in Sanskrit. Those with a passable knowledge of Sanskrit will immediately see the string "vida" in the phrase, which is, as can be easily guessed, taken from "viday", meaning goodbye in Sanskrit.
Anyways, the reason I am using this phrase is, for the next 3 months, I am going to disappear off the face of blogosphere and perhaps, even the internet. Going for a field exercise in some village with almost no electricity/ internet access. Will see you near the end of July!!