'Overseen' in Oxford

In this blog entry, I'll incorrectly use the term overseen as a visual analog of overhead. But I like it, so I'm going to do it anyway.

As many of you---perhaps most of you---know, I've spent the majority of my days since Monday September 8th marking Masters dissertations. Today I got down to the last two ("Not more than two...") dissertations and the final one, which I just finished, had a very pleasant surprise. Namely, it included the invention of a new chemical element: criterium.