morcellation

noun
mor·​cel·​la·​tion | \ ˌmȯr-sə-ˈlā-shən How to pronounce morcellation (audio) \

Medical Definition of morcellation

1 : division and removal in small pieces (as of a tumor)
2 : the surgical cutting of the skull into small pieces and leaving them in place to allow more even or symmetrical expansion of the brain and skull during growth