Definition of U-boat noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈjuː bəʊt//
; NAmE NAmE//ˈjuː boʊt//
Types of boats and ships
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a German submarine (= a ship that can travel underwater) See related entries: Types of boats and ships Word Originfrom German U-boot, abbreviation of Unterseeboot ‘undersea boat’.
See the Oxford Advanced American Dictionary entry: U-boat