whiteheadPronunciation: /ˈwʌɪthɛd/Definition of whitehead noun 1 informal a pale or white-topped pustule on the skin. 2a small New Zealand songbird with a white head and underparts, found only on the North Island. Mohoua albicilla, family Pachycephalidae (or Acanthizidae) whitehead in other Oxford dictionaries Definition of whitehead in the US English dictionary