subterrestrial
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sub·ter·res·tri·al
(sŭb′tə-rĕs′trē-əl)adj.
Subterranean; underground.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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subterrestrial
adjectiveLocated or operating beneath the earth's surface:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.