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Definition of: autochthonous
(ô·tok′thə·nəs) adjective
1. Sprung from the soil; native to a place; indigenous; aboriginal.
2. Geol. Of or pertaining to rocks which, with their constituents, have been formed in situ, as rock salt, stalactites, etc. Also au·toch′tho·nal, au·toch·thon·ic (ô′·tok·thon′ik).
—au·toch′tho·nous·ly adverb
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