I need a public domain, comprehensive japanese lexicon.  Ideally, it
would have every form of every word in every writing system used in
Japanese - so, inclusive of every morphological variant of every word
would be good, as would inclusive of every both kanji and kana, and so
on.  I realize this is a lot to ask - I will settle for an approxition
thereof.

I already know about EDICT - this is ok, but I would like something
more complete - so a requirement for a valid answer is that the
resource be substantially more comprehensive than EDICT.