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subterrestrial

[ suhb-tuh-res-tree-uhl ]
/ ˌsʌb təˈrɛs tri əl /
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adjective
underground; subterranean.
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Origin of subterrestrial

First recorded in 1605–15; sub- + terrestrial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
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