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Interstitial

/ˌintərˈstiSHəl/

Adjective

1. Of, relating to, or situated in an interstice. (wiktionary.org)

2. (Anatomy) Pertaining to or situated between parts or in the interspaces of a tissue. (biology-online.org)

3. (Of minute animals) Living in the spaces between individual sand grains in the soil or aquatic sediments. (Google Dictionary)

Word origin: From Old French interstice (14c.) and directly from Latin interstitium “interval,” literally “space between,” from inter- “between” + stem of stare “to stand” + -al.

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