If an atom is fully ionized by removing all electrons, is it still an atom?

This is a question about terminology. To me, it's clear that the nucleus of an atom is still an atom. But a comment by Willie Wong at Is nature symmetric between particles and antiparticles? raises this question. Similarly, arguments go either way at the physics forums question: "is it possible for an atom to have no electrons?" http://www.physicsforums.com/showthread.php?t=50333