Meaning of “subterranean” in the English Dictionary

british dictionary

"subterranean" in British English

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subterraneanadjective

uk /ˌsʌb.tərˈeɪ.ni.ən/ us /ˌsʌb.təˈreɪ.ni.ən/

under the ground:

subterranean passages
a subterranean river

(Definition of “subterranean” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"subterranean" in American English

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subterraneanadjective [ not gradable ]

us /ˌsʌb·təˈreɪ·ni·ən/

under the ground:

a subterranean passage/river

(Definition of “subterranean” from the Cambridge Academic Content Dictionary © Cambridge University Press)