Russian Collection gives extended explanation of Russian words as well as synonyms, antonyms and usage of examples. You can get explanations by copying and pasting the word in question directly into the Russian Collection window.
Russian Collection includes 6 Russian dictionaries:
1. Russian Heritage (110,000 entries)
2. Russian Dictionary by Dahl (46,000 entries)
3. Synonyms (30,000 entries)
4. Antonyms (30,000 entries)
5. Paronyms (words that are similar in sound but differ in sense; 450 entries)
6. Etymological Dictionary (explanations of origin and historical development of words; 7,600 entries)
7. Geographic Names Dictionary (10,000 entries)
8. Dictionary of foreign words in Russian language (20,000 entries)