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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.
Interstitial impurity atoms fit into the open space between the bulk atoms of the lattice structure. An example of interstitial impurity atoms is the carbon atoms that are added to iron to make steel. Carbon atoms, with a radius of 0.071 nm, fit nicely in the open spaces between the larger (0.124 nm) iron atoms.