turtleneckPronunciation: /ˈtəːt(ə)lnɛk/Translate turtleneck | into French | into German | into Italian | into Spanish Definition of turtleneck noun British a high, round, close-fitting neck on a knitted garment: [as modifier]:a cream turtleneck sweater a sweater with a turtleneck. North American term for polo neck.Derivatives turtlenecked adjective turtleneck in other Oxford dictionaries Definition of turtleneck in the US English dictionary