subterraneous

subterranean

[suhb-tuh-rey-nee-uhn]
adjective Also, subterraneous.
1.
existing, situated, or operating below the surface of the earth; underground.
2.
existing or operating out of sight or secretly; hidden or secret.
noun
3.
a person or thing that is subterranean.
4.
a subterrane.

Origin:
1595–1605; < Latin subterrāne(us) (see subterrane) + -an

subterraneanly, subterraneously, adverb
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World English Dictionary
subterranean (ˌsʌbtəˈreɪnɪən)
 
adj
1.  subterraneous, Also: subterrestrial situated, living, or operating below the surface of the earth
2.  existing or operating in concealment
 
[C17: from Latin subterrāneus, from sub- + terra earth]
 
subter'raneanly
 
adv
 
subter'raneously
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

subterranean
c.1600, from L. subterraneus "underground," from sub "under" + terra "earth" (see terrain).
Online Etymology Dictionary, © 2010 Douglas Harper
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