1. preserving a dead body by embalming and wrapping it, especially as practiced in ancient Egypt
2. drying out and preserving something naturally or artificially

Examples

• The ancient Egyptians were skilled at mummifying their pharaohs.
• The dry desert air was mummifying the animal remains.
• Scientists are mummifying the specimen for long-term study.
• The hot attic was slowly mummifying the old newspapers.
• They spent weeks mummifying the body according to traditional methods.
• The arid climate is naturally mummifying organic materials.