where can I find dictionaries for the spellchecker?

I learned that I can load additional dictionaries (.dic) into the spellchecker. 
as there are some German explanations & variable names within my code, spellchecking ... fails to often.

so, what would be the best place to finde a german.dic file? I googled for it; and looked for the english.dic's within my filesystem to "fake" their format, but did not suceeed...

best wishes

Harald