No it's not a dinosuar.

Wondered if there was any good thesauruses (thesaurasii?) for Japanese (monolingual of course). Cos I find sometimes whole definitions of words (monolingualy) can be quite a lot to deal with at times and noticed that when my dictionary gives me alternatives that mean the same thing I understand it quickly and without too much hassle.

Is there any convenient source anyone knows of?

I like Weblio myself. There's also the one on Yahoo!辞書.

Interesting. Thanks I'm sure they'll come in handy