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).]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.