interstitial
adjective
in·ter·sti·tial
ˌin-tər-ˈsti-shəl
1
: occurring in or being an interval or intervening space or segment : of, relating to, or forming an interstice
an interstitial space
… the site has been running interstitial ads, which consist of a full page of advertising between editorial pages, for a little more than a year.—Carl Sullivan
2
a
: situated within but not restricted to or characteristic of a particular organ or tissue
—used especially of fibrous tissue
b
: affecting the interstitial tissues of an organ or part
interstitial cystitis
3
: being or relating to a crystalline compound in which usually small atoms or ions of a nonmetal occupy holes between the larger metal atoms or ions in the crystal lattice
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Merriam-Webster unabridged
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