Holy sh!t!
That's not really a Russian word, since the roots are German. How about these:(Translation:)
KavkazChat - the longest word! (game)
Rentgenehlektrokardiograficheskogo - 33 letters
('of x-ray electrocardiographic').
(Translation:)
1. The longest word in the Russian language, though not registered in the dictionary:
Vodogryazetorfoparafinolechenie; ('water-mud-parafin treatment')
2. Longest word in the Bulgarian language consists of 39 letters and means 'Do not disrupt the constitution', and looks like this:
NEPROTIVOKONSTITUTSIONSTVUVATELSTVUVAYTE;
3. Newspaperman Bruce LaBruce in one of his articles asserted that there is no longer word in modern English than 'antidisestablishmentarianism', but one of his readers disagreed and sent in his collection of letters:
Pneumonoultramicroscopicsilicovolcaniosis;