Meaning of the word subterranean in English

What does subterranean mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

subterranean

US /ˌsʌb.təˈreɪ.ni.ən/
UK /ˌsʌb.təˈreɪ.ni.ən/

Adjective

1.

under the ground:

Example:
subterranean passages
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