Final answer:
Interstitial refers to a type of tissue found between other tissues or organs. Interstitial fluid, also known as tissue fluid, bathes and surrounds the cells of multicellular animals, providing nutrients and aiding in waste removal.
Step-by-step explanation:
The term 'interstitial' refers to a type of tissue found between other tissues or organs. It is a part of the extracellular fluid called interstitial fluid that surrounds and bathes the cells of multicellular animals. Interstitial fluid provides nutrients to cells and helps in waste removal. It is similar to plasma in composition and communicates freely with plasma through capillary endothelium.