1a native or inhabitant of any of the islands of Melanesia.
2 [mass noun] any of the languages of Melanesia, mostly Austronesian languages related to Malay but also including Neo-Melanesian (or Tok Pisin), an English-based pidgin.
adjective
relating to Melanesia, its peoples, or their languages.
Melanesian in other Oxford dictionaries
Definition of Melanesian in the US English dictionary