The word [interstice] is a derivation of the Latin term [interstitium] meaning "interval" or "spaces between". The plural form is [interstices]. The terms is used in anatomy to denote small spaces within a structure. As an example, bone marrow and venous sinuses are found in the [interstices] of the cancellous bone in the body of a vertebra.
The term is also used to describe different pathologies such as insterstitial cystitis and instertitial lung disease.
Word suggested by: Sara Mueller