Interstitial

Interstitial is a generic term for referring to the space between other structures or objects.

In crystallography, interstitial space refers to the open spaces within the crystal lattice.

In anatomy, interstitial cells are cells found in the spaces between organs and other tissues. Similarly, interstitial fluid is the fluid between organs and tissues, outside of the lymphatic or cardio vascular systems.

In television, the term refers to short programming which is often shown between movies or other events.

The term has been adopted by World Wide Web developers to refer to a page that is displayed before an expected content page (e.g. an advertisement or an age confirmation).

Interstitial derives from the Latin interstitialis, literally 'placed between', from inter: between, and sistere-stiti-statum: to place.