allochthonous
adjective
al·loch·tho·nous
variants or less commonly allocthonous
-thənəs
1
a
: of or relating to the rocks of an allochthon
b
of coal : formed elsewhere than in situ and hence not autochthonous
c
of limestone : composed largely of organic debris moved far from the place where the base organisms lived
2
biology : of foreign origin : introduced compare autochthonous
Word History
Etymology
all- + -chthonous (as in autochthonous)
First Known Use
1888, in the meaning defined at sense 1a