What counts as "beyond a dictionary entry". Are you talking about length, or content?
The latter. The aforementioned "Nigger" article contains a great deal of material that one would not find in any dictionary with which I'm familiar.
It also contains a great deal of material that one would not find in any encyclopedia with which I'm familiar.
And most of the material I think would be *more likely* to be in a dictionary than an encyclopedia. Meaning, etymology, usage, derivatives. These are all things more likely to be found in a dictionary than an encyclopedia.
Basically, if you took a dictionary, and removed the space requirements, and then took an encyclopedia, and removed the space requirements, the content of http://en.wikipedia.org/wiki/Nigger would likely be in the former, and not the latter.