U-boat

submarine

U-boat is the anglicized version of the German word , itself an abbreviation of Unterseeboot (undersea boat), and refers to military submarines operated by Germany in World War I and World War II. Although in theory U-boats could have been useful fleet weapons against enemy naval warships, in practice they were most effectively used in an economic-warfare role, enforcing a naval blockade against enemy shipping. The primary targets of the U-boat campaigns in both wars were the merchant convoys bringing supplies from Canada and the United States to Europe. Austrian submarines of World War I were also known as "U-boats".
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Noun
1. a submersible warship usually armed with torpedoes
(synonym) submarine, pigboat, sub
(hypernym) submersible, submersible warship
(hyponym) attack submarine
(part-meronym) conning tower

u-boat /'ju:bout/
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U-BOAT. SOTTOMARINO TEDESCO. SOMMERGIBILE