The lobed ones aside, we discussed terms of art the first year I began posting here, AnnaS. I think I may have been the one looking for such a term, and one of the old dogs here provided it. I've been using it ever since--always watching carefully the face of the person to whom I am casually dropping the term to see whether he's showing any understanding. It is a very useful term in conversation, though I wonder seriously whether people at large understand it.