Pronunciation: (in"tur-stish'ul), [key]
1. pertaining to, situated in, or forming interstices.
2. Anat.situated between the cells of a structure or part: interstitial tissue.
Crystall.an imperfection in a crystal caused by the presence of an extra atom in an otherwise complete lattice. Cf. vacancy (def. 6).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.