restauranterU.S.|ˈrɛstəˌrɒntə(r)| [f. restaurant + -er1.] = restaurateur 1. 1887Ohio State Jrnl. 20 July, The headquarters of Mr. Kiesewetter are at Diebold's, an opulent restauranter and general purveyor to the wants of delegates.1938Sun (Baltimore) 11 June 9/2 (heading) Restauranter jailed in fatal shooting.