Describing an organism that originates from a place other than that in which it is found. The organism is usually a transient member of a community. Compareautochthonous.
Geology and Earth Sciences
Not indigenous; acquired. In the Earth sciences the term is applied to geologic units that originated at a distance from their present position. Such displacement may be due to lateral thrusting and overfolding, or to gravity gliding. Compareautochthonous.
Geography
Of rock formed of materials brought from outside, for example from sediments transported by ice; till is an example.