1. existing or occurring underground
Usage: technical; geology
2. relating to or living in underground environments
Usage: biology

Examples

• The cave system contained several hypogean species of fish.
• Hypogean waters flow through underground limestone channels.
• Scientists studied the hypogean ecosystem deep beneath the surface.
• The hypogean environment lacks natural sunlight.
• Many hypogean organisms have adapted to complete darkness.
• The research focused on hypogean biodiversity in karst regions.