English dictionary

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English *noun*: U-boat
1.	U-boat (artifact) a submersible warship usually armed with torpedoes
		Synonyms	pigboat, sub, submarine
		Broader (hypernym)	submersible, submersible warship
		Narrower (hyponym)	attack submarine, auxiliary research submarine, fleet ballistic missile submarine, nautilus, nuclear submarine, nuclear-powered submarine
		Part holonym	asdic, breather, conning tower, echo sounder, escape hatch, periscope, schnorchel, schnorkel, snorkel, snorkel breather, sonar

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