Etymology
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intussusception (n.)

"reception of one part within another," 1707, literally "a taking in," from Latin intus "within" (see ento-) + susceptionem (nominative susceptio) "a taking up, a taking in hand, undertaking," noun of action from past participle stem of suscipere "to take, catch, take up, lift up" (see susceptible).

updated on December 27, 2015

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Definitions of intussusception from WordNet

intussusception (n.)
the folding in of an outer layer so as to form a pocket in the surface;
Synonyms: invagination / introversion / infolding
intussusception (n.)
(biology) growth in the surface area of a cell by the deposit of new particles between existing particles in the cell wall;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.