AUTOCHTHONOUS Meaning of AUTOCHTHONOUS in English [au.toch.tho.nous] adj (1805) 1: indigenous, native "an ~ people" 2: formed or originating in the place where found "~ rock" "an ~ infection" -- au.toch.tho.nous.ly adv Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012