mummification

Concise Oxford English Dictionary © 2008 Oxford University Press:
mummify/ˈmʌmɪfʌɪ/

▶verb (mummifies, mummifying mummified) (usu. as adj. mummified)

• 1 (especially in ancient Egypt) preserve (a body) as a mummy.

• 2 dry up (a body) and so preserve it.

– derivatives
mummification noun.