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

subterranean

adjective
 
/ˌsʌbtəˈreɪniən/
 
/ˌsʌbtəˈreɪniən/
[usually before noun] (formal)
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  1. under the ground
    • a subterranean cave
    Oxford Collocations DictionarySubterranean is used with these nouns:
    • chamber
    • passage
    • tunnel
    See full entry
    Word Originearly 17th cent.: from Latin subterraneus (from sub- ‘below’ + terra ‘earth’) + -an.
See subterranean in the Oxford Advanced American Dictionary
previously
adverb
 
 
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