Interstitial (adjective)

Of or situated in the spaces between things; occurring in the interstices.

Origin:

Late 16th century: from latin interstitium, from intersistere 'intervene, stand between', from inter- 'between' + sistere 'stand'.

Examples:

1. A cyst is a fluid-filled, sac-like structure that can develop within the interstitial spaces of the body.
2. Interstitial spaces in rocks provide places for water and gas to accumulate.
3. Interstitial fluids are vital for maintaining normal tissue function.
4. Interstitial air spaces are present in the leaves of many plants, allowing for the exchange of oxygen and carbon dioxide.
5. Interstitial channels between cells provide a path for waste removal and exchange of nutrients.