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

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "mummification":
   air-drying, anhydration, ashes, blast-freezing, body, bones,
   bottling, brining, cadaver, canning, carcass, carrion, clay,
   corning, corpse, corpus delicti, crowbait, curing, dead body,
   dead man, dead person, decedent, dehumidification, dehydration,
   desiccation, drainage, dry bones, dry-curing, drying, drying up,
   dust, earth, embalmed corpse, embalming, embalmment, evaporation,
   food for worms, freeze-drying, freezing, fuming, insolation,
   irradiation, jerking, late lamented, marination, mortal remains,
   mummy, organic remains, pickling, potting, quick-freezing,
   refrigeration, relics, reliquiae, remains, salting, seasoning,
   skeleton, smoking, stiff, stuffing, taxidermy, tenement of clay,
   the dead, the deceased, the defunct, the departed, the loved one,
   tinning, withering