ChumashPronunciation: /ˈtʃuːmaʃ/Definition of Chumash noun (plural same or Chumashes) 1a member of an American Indian people inhabiting coastal parts of southern California. 2 [mass noun] the extinct Hokan language of the Chumash. adjective relating to the Chumash or their language. Chumash in other Oxford dictionaries Definition of Chumash in the US English dictionary