redivivus \red-uh-VY-vuhs; -VEE-\ (adjective) - Living again; brought back to life; revived; restored.
"'He can't be redivivus if he's never died,' Diotallevi said. 'Sure he's not Ahasuerus, the wandering Jew?'" -- Umberto Eco, 'Foccault's Pendulum'
Redivivus comes from Latin, from the prefix red-, re-, "again" + vivus, "alive."