Well I feel a bit silly for not knowing the other dwarf planets (aside from Pluto).
Under the IAU definition approved on August 24, 2006, Eris is a "dwarf planet" along with Pluto, Ceres, Haumea and Makemake.
I guess it could be excused by my being in law school at the time, but really, that's a poor excuse.
http://en.wikipedia.org/wiki/Dwarf_planet
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