Webster's English Dictionary

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interstitial

in.ter.sti.tial \.int-*r-'stish-*l\ \-*-le-\ aj 1: relating to or situated 
   in the interstices  2a: situated within but not restricted to or 
   characteristic of a particula r organ or tissue - used esp. of fibrous 
   tissue 2b: affecting the interstitial tissues of an organ or part  - 
   in.ter.sti.tial.ly av