I think a lot of us have discovered how great "it" works for "itis" words, as in derit expands to dermatitis. We had a thread on that previously.
Well, I don't think words ending in osis are quite as common, but they sure are out there a lot. I was just thinking that I have nothing for those, and I'm going to change that. I'm going to make it first three letters of the word and os. So, ichos wuld expand to ichthyosis.
Do you already have a system for words ending in "osis?"
Excuse me while I go do a lot of things to my expander!