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subterranean
[ˌsʌbtəˈreɪniən]
📖 Definition
adj. being under the surface of the earth; working in secret
🖼️ Picture This
Ancient rock layers exposed in a canyon wall
💬 Example Sentence
The geologist studied the subterranean formation for clues to its age.
📝 Word Roots & Related
sub-under, behind terrearth terrain n. terrestrial adj.