autoistU.S.|ˈɔːtəʊɪst| [f. auto n.2 1 + -ist.] One who uses or drives an automobile, a motorist. 1903Sci.Amer. 21 Feb. 134/1 Bills giving equal rights to autoists and the drivers of horses.1904N.Y. Globe 29 Mar. 4 A protest against the young lawbreakers who stone autoists.