Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
three-decker is a noun meaning "made with three slices of usually toasted bread". It carries 3 recorded senses.
made with three slices of usually toasted bread
any ship having three decks
a warship carrying guns on three decks
Definitions, synonyms and semantic relations for three-decker come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.