IPA: /ˌɪn.təˈstɪʃ.əl/
KK: /ɪnˈtɜrstɪʃəl/
Relating to the small spaces between tissues or parts of an organ.
The doctor explained how interstitial fluid helps to nourish the cells in the body.
Interstitial → It is formed from "inter-" (meaning between) and "sistere" (meaning to stand). The word describes something that stands or exists in between spaces.
Think of something that exists 'between' ('inter-') two things that 'stand' ('sistere') — that's what interstitial means.