Definition of hyporheic in US English:

hyporheic

adjective

  • Denoting an area or ecosystem beneath the bed of a river or stream that is saturated with water and that supports invertebrate fauna which play a role in the larger ecosystem.

    ‘the hyporheic zone’
    • ‘This species is known from shallow dug wells, a Sphagnum bog, and the hyporheic zone of streams.’

Pronunciation

hyporheic

/ˌhīpəˈrēik/