Chthonic

//ˈkθɒnɪk// adj

Definitions

Adjective
  1. 1
    Dwelling within the underworld. not-comparable, usually

    "The young pantheon had remanded their elders to the role of smouldering, chthonic gods; to inhabiting dark, deep places, hidden from mortal eyes and influence."

Adjective
  1. 1
    dwelling beneath the surface of the earth wordnet

Etymology

From Ancient Greek χθών (khthṓn, “ground, soil”) + -ic.

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