Suggestions for 6 lexicons.

Hello my friends.

In 2012, I must have 6 lexicons about Russian language. I need your help.

Specifically:

1) I want one lexicon in Russian language which explains the meaning of a word in Russian language. Which one has the most Russian words?

2) An English-Russian and Russian-English lexicon.

3) An English-Russian and Russian-English lexicon for words about sciences and technology.

4) A Modern Greek-Russian and Russian-Modern Greek lexicon.

5) A Modern Greek-Russian and Russian-Modern Greek lexicon for words about sciences and technology.

6) A Byzantine Greek-Russian and Russian-Byzantine Greek lexicon for words about Orthodox Christianity.

I want your suggestions my friends. And of course when I have experience I will tell you my opinion in this topic. Thank you.

Is online dictionarys totally out of the question? Because there are a few out there who are quite superior to physical lexicons.

Yes, of cource. You can suggest and online dictionaries.

An excellent (so far) online lexicon for Greek - Russian and Russian - Greek is this: Греческо-русский / русско-греческий онлайн словарь. Ηλεκτρονικό ελληνορωσικό λεξικό.