u-boat

noun

1. a submersible warship usually armed with torpedoes

   Synonyms

   • submarine, pigboat, sub, U-boat

   Less specific

   • submersible, submersible warship

   More specific

   • attack submarine, auxiliary research submarine, fleet ballistic missile submarine, nautilus, nuclear submarine, nuclear-powered submarine

   Parts

   • conning tower, escape hatch, periscope, snorkel, schnorkel, schnorchel, snorkel breather, breather, sonar, echo sounder, asdic