Definitions of U-boat

n a submersible warship usually armed with torpedoes

pigboat, sub, submarine
show 4 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

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