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subterranean

sub·ter·ra·ne·an

subterranean

 
pronunciation:
suhb t reI ni n
parts of speech:
adjective, noun
features:
Word Combinations (adjective), Word Parts
part of speech: adjective
definition 1: below the earth's surface; underground.
similar words:
cavernous
definition 2: secret or hidden, as if underground.
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part of speech: noun
definition: one that is or operates underground.
derivations: subterraneous (adj.), subterraneanly (adv.), subterraneously (adv.)
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