English

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

 

subterranean

 adjective
adjective
BrE BrE//ˌsʌbtəˈreɪniən//
 
; NAmE NAmE//ˌsʌbtəˈreɪniən//
 
[usually before noun] (formal)
 
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under the ground a subterranean cave Word Origin early 17th cent.: from Latin subterraneus (from sub- ‘below’ + terra ‘earth’) + -an.
See the Oxford Advanced American Dictionary entry: subterranean