The only thing I'm having problems comprehending are the words that almost never get used in day to day modern conversation.
It's not JUST things like ennui (which I did actually look up), it's the medical and scientific terms too.
Now, a writer should always have some sort of self-made reference sheet available, especially in technical reports and the like, but the reader, in my opinion, shouldn't have to go through the trouble of opening up another browser window/tab/whatever to look up a word. Sometimes using latin names for organisms can add to the mystery and creepiness of the page, but more often than not it's just plain annoying.
I'm not asking for a huge all-inclusive list of every technical word ever used on the site, just the basic ones that get re-used a lot. It may be a regional thing, but I have never heard the word ennui (to repeat an example) outside of a vocabulary testing environment, and then only rarely. It's not knowledge most people have a need to retain.
If I'm the only one having this problem, then I will completely drop it and move on. But if others have had similar issues, I would gladly help in the creation of such a page, whether it be through digging for the words themselves, looking up definitions, marking/commenting on pages that are overly verbose/technical, or what have you.
What I'm trying to say is that I'm not demanding that any one person or group do this for me, but instead am gaining support for an idea I believe would help improve the site as a whole.