Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
macrocephalous is an adjective meaning "having an exceptionally large head and brain". It carries one recorded sense.
having an exceptionally large head and brain
Definitions, synonyms and semantic relations for macrocephalous come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.