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English definition of “interstitial”

interstitial

adjective (medical)    /ˌɪn.təˈstɪʃ.əl/ US  /ˌɪn.tərˈstɪʃ.əl/ specialized
relating to spaces between cells, tissues, or organs in the body: Deficiencies of sodium and water can cause shrinkage of the interstitial space. relating to connective tissue that supports the working parts of an organ in the bodySubstances and structures in the body
(Definition of interstitial adjective (medical) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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