This word is acceptable for play in the UK dictionary that is being used in the following games:

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adj. Originating in a place other than where it is found.

adj. Buried or found in a place remote from the site of formation.

adj. of rocks, deposits, etc.; found in a place other than where they and their constituents were formed

"In terms of flora, the most affected is San Félix island, with 42% of allochthonous plants."

autochthonous   

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