IPA: /ɪnˈtɜːrstɪs/
KK: /ɪnˈtɜrstɪs/
A small or narrow space between things or parts, often used to describe gaps or breaks in a continuous structure.
The artist painted a tiny flower in the interstice between the two large rocks.
Interstice → It is formed from "inter-" (meaning between) and "stare" (meaning to stand). The word describes a space that stands between two things, hence a gap or interval.
Think of something that stands 'between' ('inter-') two objects — that's what an interstice refers to, a gap or space in between.