Jadzia Dax / dʒ æ d ˈ z iː ə ˈ d æ k s /, played by Terry Farrell, is a fictional character from the science fiction television series Star Trek: Deep Space Nine. Jadzia Dax is a joined Trill. Though she appears to be a young woman, Jadzia lives in symbiosis with a wise and long-lived creature, known as a symbiont, named Dax.