Letter I

Interstitial

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Pertaining to being between things, especially between things that are normally closely spaced.</P> The word 'interstitial' comes from the Latin 'interstitium' which was derived from 'inter' meaning 'between' + 'sistere' meaning 'to stand' = to stand between.</P> The word 'interstitial' is much used in medicine and has specific meaning depending on the context.

For instance, interstitial cystitis is a specific type of inflammation of the bladder wall.

Interstitial radiation involves placing radioactive material directly into a tumor.

Interstitial pneumonia is inflammation of the lung which involves the meshwork of lung tissue (alveolar septa) rather than the air spaces (alveoli).

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