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1. of or relating to an interstice or interstices. 2. (Chemistry) physics forming or occurring in an interstice: an interstitial atom. 3. (Chemistry) chem containing interstitial atoms or ions: an interstitial compound. 4. (Biology) anatomy zoology occurring in the spaces between organs, tissues, etc: interstitial cells.
From Wikipedia, the free encyclopedia. An interstitial pregnancy is a uterine but ectopic pregnancy; the pregnancy is located outside of the uterine cavity in that part of the fallopian tube that penetrates the muscular layer of the uterus.he term cornual pregnancy is sometimes used as a synonym, but remains ambiguous as it is also applied to indicate the presence of a pregnancy located within the cavity in one of the two upper horns of a bicornuate uterus.