Etymology
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chthonic (adj.)

"of or pertaining to the under world," 1882, with -ic + Latinized form of Greek khthonios "of the earth, in the earth," from khthōn "the earth, solid surface of the earth" (mostly poetic), from PIE root *dhghem- "earth."

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Definitions of chthonic

chthonic (adj.)
dwelling beneath the surface of the earth;
Synonyms: chthonian / nether
From wordnet.princeton.edu