Definitions

1. adjective

Originating or produced in a place other than one’s own native region or country, especially with reference to the origin of a plant or animal species.

“The allochthonous species found in the new ecosystem were vastly different from those found in the surrounding area.”

2. noun

A plant or animal species that is not native to a particular region or country.

“The introduction of allochthonous species in the area had a significant impact on the local biodiversity.”