I'm sure there are enough people here who can help me with the following sentence:

"In addition, we did not take structural uncertainty into account, which might very well eclipse any parameter uncertainty."

I was rather proud of it myself for this sentence (as to me it says exactly what it needs to say, in less than the five sentences that a colleague of mine needed), but my boss just asked me what "eclipse" means, and that basically means I should rewrite it or she won't accept it "as real English". It's part of a scientific paper, and as such it might not by "too science"-y, but I was under the impression that it was correct English.

So, any synonyms I can (should) use?