Dictionary Definition

interstitial adj : of or relating to interstices

User Contributed Dictionary

of, relating to, or situated in an interstice

Interstitial may refer to:

Interstitial program, short television programming which is often shown between movies or other events
Interstitial defect, a variety of crystallographic defects
interstitial atom, an atom outside crystallographic lattice
Interstitial fluid, a solution which bathes and surrounds the cells of multicellular animals
Interstitial webpage, a web page that is displayed before an expected content page, often to display advertisements or confirm the user's age
Interstitial art, any work of art whose basic nature falls between, rather than within, the familiar boundaries of accepted genres or media

Meaning : In the middle of