Chumash Syllabification: (Chu·mash)Pronunciation: /ˈCHo͞oˌmaSH/Definition of Chumash noun (plural same or Chumashes) 1a member of an American Indian people inhabiting coastal parts of southern California. 2the Hokan language of the Chumash. adjective relating to the Chumash or their language. Origin:Chumash, literally 'islander'Chumash in other Oxford dictionaries Definition of Chumash in the British & World English dictionary