interstitial

in·ter·sti·tial
ˌin(t)ərˈstiSHəl/
adjective
  1. of, forming, or occupying interstices.
    “the interstitial space”
    • ECOLOGY
      (of minute animals) living in the spaces between individual sand grains in the soil or aquatic sediments.
      “the interstitial fauna of marine sands”

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