U-boat

[ yoo-boht ]
/ ˈyuˌboʊt /
|

noun

a German submarine.

Origin of U-boat

1910–15; < German U-Boot, short for Unterseeboot literally, undersea boat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for u-boat

U-boat

noun

a German submarine, esp in World Wars I and II

Word Origin for U-boat

from German U-Boot, abbreviation for Unterseeboot, literally: undersea boat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012