U-boat

Synonyms:

pigboat, sub, submarine

Types:

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attack submarine

a military submarine designed and armed to attack enemy shipping

auxiliary research submarine

a submarine for research purposes

fleet ballistic missile submarine

a submarine carrying ballistic missiles

nautilus, nuclear submarine, nuclear-powered submarine

a submarine that is propelled by nuclear power

Type of:

submersible, submersible warship

a warship designed to operate under water