Intussusception

n.	1.
	1.	The reception of one part within another.
	2.	(Med.) The abnormal reception or slipping of a part of a tube, by inversion and descent, within a contiguous part of it; specifically, the reception or slipping of the upper part of the small intestine into the lower; introsusception; invagination.
	3.	(Bot.) The interposition of new particles of formative material among those already existing, as in a cell wall, or in a starch grain.
	4.	(Physiol.) The act of taking foreign matter, as food, into a living body; the process of nutrition, by which dead matter is absorbed by the living organism, and ultimately converted into the organized substance of its various tissues and organs. Dead bodies increase by apposition; living bodies by intussusception. - McKendrick.

Noun	1.	intussusception - the folding in of an outer layer so as to form a pocket in the surface; "the invagination of the blastula" Synonyms: infolding, introversion, invagination
	2.	intussusception - (biology) growth in the surface area of a cell by the deposit of new particles between existing particles in the cell wall

Pronunciation: (IN-tuh-suh-SEP-shun)

A rare disorder. A part of the intestines folds into another part of the intestines, causing blockage. Most common in infants. Can be treated with an operation.

biological process, infolding, introversion, intussuscept, invagination, organic process