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Pronunciation:  o't√Ękthunus

WordNet Dictionary
  1. [adj]  of rocks, deposits, etc.; found where they and their constituents were formed
  2. [adj]  originating where it is found; "the autochthonal fauna of Australia includes the kangaroo"; "autochthonous rocks and people and folktales"; "endemic folkways"; "the Ainu are indigenous to the northernmost islands of Japan"

AUTOCHTHONOUS is a 13 letter word that starts with A.


 Synonyms: autochthonal, autochthonic, endemic, indigenous, native
 Antonyms: allochthonous



Biology Dictionary
  1. Of the inhabitants of a region, original; earliest known.
  2. Derived from within a system, such as organic matter in a stream resulting from photosynthesis by aquatic plants. Compare allochthonous.
Thesaurus Terms
 Related Terms: abecedarian, aboriginal, ancestral, antenatal, antepatriarchal, atavistic, beginning, budding, creative, elemental, elementary, embryonic, endemic, fetal, formative, foundational, fundamental, gestatory, homebred, homegrown, humanoid, in embryo, in its infancy, in the bud, inaugural, inceptive, inchoate, inchoative, incipient, incunabular, indigenous, infant, infantile, initial, initiative, initiatory, introductory, inventive, nascent, natal, native, native-born, original, parturient, patriarchal, postnatal, preadamite, preglacial, pregnant, prehistoric, prehuman, prenatal, primal, primary, prime, primeval, primitive, primogenial, primoprimitive, primordial, pristine, procreative, protohistoric, protohuman, rudimental, rudimentary, ur, vernacular