adj.
- Relating to, occurring in, or affecting interstices.
- Anatomy. Relating to or situated in the small, narrow spaces between tissues or parts of an organ: interstitial cells; interstitial fluid.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.