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1. Relating to spaces or interstices in any structure. 2. Relating to spaces within a tissue or organ, but excluding such spaces as body cavities or potential space. Cf.:intracavitary.
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in·ter·sti·tial .int-ər-'stish-əl adj
1) situated within but not restricted to or characteristic of a particular organ or tissue used esp. of fibrous tissue
2) affecting the interstitial tissues of an organ or part <\interstitial hepatitis>
3) occurring in the part of a fallopian tube in the wall of the uterus <\interstitial pregnancy>
in·ter·sti·tial·ly -ə-lē adv
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in·ter·sti·tial (in″tər-stishґəl) pertaining to or situated between parts or in the interstices of a tissue.Medical dictionary. 2011.