intussusception

nouns

the folding in of an outer layer so as to form a pocket in the surface
"the invagination of the blastula"
is derived from
(biology) growth in the surface area of a cell by the deposit of new particles between existing particles in the cell wall
domain category
the science that studies living organisms
is a type of (narrower)
(biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level
"he proposed an indicator of osseous development in children"