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 ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.