subterranean
adjective/ˌsʌbtəˈreɪniən/
/ˌsʌbtəˈreɪniən/
[usually before noun] (formal)- under the ground
- a subterranean cave
Oxford Collocations DictionarySubterranean is used with these nouns:- chamber
- passage
- tunnel
- …
Word Originearly 17th cent.: from Latin subterraneus (from sub- ‘below’ + terra ‘earth’) + -an.Definitions on the go
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subterranean