Definition of interstitial adjective from the Oxford Advanced Learner's Dictionary

 

interstitial

 adjective
adjective
BrE BrE//ˌɪntəˈstɪʃl//
 
; NAmE NAmE//ˌɪntərˈstɪʃl//
 
(medical)
 
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in or related to small spaces between the parts of an organ or between groups of cells or tissues interstitial cells
See the Oxford Advanced American Dictionary entry: interstitial