"elisive" only gets 393 hits on google, and most seem to by typos for "elusive". This could be a form of the word "elide"

The others can be looked up, if you try hard enough. "Occlusive" is not in Webster 1913, but google will tell you, naturally, that it means "Occluding or tending to occlude" - so clearly, this story blocks one's view of stuff.

Google knows all.