Term for student who was thrown out of university?

Expelled, as in the student was expelled from university. It's basically a crossover of the concepts of suspension or expulsion from high school

EDIT: I should probably point out that Rusticated would have been my first choice (had I remembered it) and it's actually the prescribed word for the concept. Moonstar2001 is bang on here

Sent down is the term used at the old English universities.

Any of these:

Expelled

Debarred

Rusticated

The noun for the object of expulsion is the ungraceful 'expellee'. I've only heard the term used once or twice. I suspect it was an on-the-spot construction. 'Winnowed' may apply as an adjective if the circumstances are behavioral rather than academic.