turtleneck Syllabification: (tur·tle·neck)Pronunciation: /ˈtərtlˌnek/Translate turtleneck | into French | into German | into Italian | into Spanish Definition of turtleneck noun a high, close-fitting, turned-over collar on a garment, typically a shirt or sweater: [as modifier]:a turtleneck sweater a shirt or sweater with a high, close-fitting, turned-over collar. Derivatives turtlenecked adjective turtleneck in other Oxford dictionaries Definition of turtleneck in the British & World English dictionary