NinjaWords - a really fast dictionary

In a forest of online dictionaries, here's a stand-out tree.

I quote them:

Why is this called Ninjawords?
Ninjas are three things:
>They're smart
>They're accurate
>They're really fast
Ninjawords is based on these principles. Plus everyone likes ninjas.

Look at their "Find Out More" page to see what you can do with your own dictionary searches.