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