Pertaining to materials, particularly rock masses, that formed somewhere other than their present location, and were transported by fault movements, large-scale gravity sliding, or similar processes. [..]

Refers to something formed elswhere than its present location. Antonym of autochthonous.

something organic imported into an ecosystem from outside of it (e.g., nutrients brought by streams or blown in on the wind). Contrasts with Autochthonous.

coming from resources or drives exterior to a particular operating system: not native or natural.

biology - pertaining to organic materials produced outside an aquatic system

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

opposite of autochthonous, originating from outside a system, non-native, introduced

Food material reaching an aquatic community in the form of organic detritus.

<ecology> Derived from outside a system, such as the leaves of terrestrial plants that fall into a stream. Compare: autochthonous. (09 Oct 1997)

derived from outside a system such as the leaves of terrestrial plants that fall into a stream