chiropractor noun [C]. › a ​person whose ​job is to ​treat ​diseases by ​pressing a person's ​joints (= ​places where two ​bones are ​connected), ​especially those in the back. chiropractic noun [U] uk /ˌkaɪə.rəʊˈpraek.rəʊˈpræk/ tɪk /-us-/ › roʊ ​the system ​of treatment used by a. chiropractor