Spiftaculous website Exemplar will show you lots of examples of that irritatingly unfamiliar vocabulary term in context so you can get the straight skinny on how it’s used. It will also give you some stats about how often your word is used by year and geographic locale. Strangely, it doesn’t give you the actual definition though–don’t ask me why–but combine it with wordnik.com for a more robust vocabulary experience.
A heads up; apparently the examples are drawn only from scientific literature. Didn’t seem to make much diff on the test words I typed in, but just so’s ya know.