Meaning of “interstitial” in the English Dictionary

"interstitial" in British English

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uk /ˌɪn.təˈstɪʃ.əl/ us /ˌɪn.tɚˈstɪʃ.əl/

interstitial adjective (medical)

specialized medical relating to spaces between cells, tissues, or organs in the body:

Deficiencies of sodium and water can cause shrinkage of the interstitial space.

specialized medical relating to connective tissue that supports the working parts of an organ in the body

interstitial adjective (BETWEEN)

formal relating to the space or time between things:

the interstitial parts of the movie that punctuate the main action

(Definition of “interstitial” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)