1. Medicine Invagination, especially an infolding of one part of the intestine into another.
2. Biology Assimilation of new substances into the existing components of living tissue.
[Medieval Latin intussusceptiō, intussusceptiōn-, a taking in, admission, from intussusceptus, past participle of intussuscipere, to take in : Latin intus, within; see en in the Appendix of Indo-European roots + Latin suscipere, to take up (sub-, sub- + capere, to take; see kap- in the Appendix of Indo-European roots).]
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