The Collaborative International Dictionary of English v.0.48:

Mummification \Mum`mi*fi*ca"tion\, n. [See Mummify.]
   The act of making a mummy.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mummification
    n 1: a condition resembling that of a mummy; "bureaucratic
         mummification in red tape"
    2: (pathology) gangrene that develops in the presence of
       arterial obstruction and is characterized by dryness of the
       dead tissue and a dark brown color [syn: dry gangrene,
       cold gangrene, mumification necrosis, mummification]
    3: embalmment and drying a dead body and wrapping it as a mummy