Definition of allochthonous adjective from the Oxford Advanced Learner's Dictionary

 

allochthonous

 adjective
adjective
BrE BrE//əˈlɒkθənəs//
 
; NAmE NAmE//əˈlɑːkθənəs//
 
(specialist)
 
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(of rock) formed at a distance from its present position compare autochthonous Word Origin early 20th cent.: from allo- ‘other’ + Greek khthōn ‘earth’ + -ous.
See the Oxford Advanced American Dictionary entry: allochthonous