The Collaborative International Dictionary of English v.0.48:

Mummify \Mum"mi*fy\, v. t. [imp. & p. p. Mummified; p. pr. &
   vb. n. Mummifying.] [Mummy + -fy: cf. F. momifier.]
   To embalm and dry as a mummy; to make into, or like, a mummy.
   --Hall (1646).
   [1913 Webster]