Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
u-boat is a noun meaning "a submersible warship usually armed with torpedoes". It carries one recorded sense.
a submersible warship usually armed with torpedoes
Definitions, synonyms and semantic relations for u-boat come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.