Definition of: intussusception

(in′təs·sə·sep′shən) noun
1. A receiving within.
2. The state of being received within.
3. Pathol. The introversion of a portion of an intestine or other tube into the portion adjoining it.
4. Physiol. The reception into an organ of foreign matter, as food, and its conversion into living tissue; interstitial growth.
5. Bot. The interposition of new molecules between the molecules of the original material, as in the cell walls of plants or grains of starch.