hypogean

/ˌhaɪpoʊˈdʒiːən/
adjective
  1. Living or growing underground.
    • The cave explorers discovered a hypogean ecosystem with unique blind fish.
    • Hypogean fungi, like truffles, grow entirely beneath the soil surface.
    • Some hypogean insects have lost their eyesight because they live in constant darkness.
Antonyms
What does "hypogean" mean? | whatsthatwordmean | whatsthatwordmean