A mummy is a corpse whose skin and dried flesh have been preserved by either intentional or incidental exposure to chemicals, extreme cold, very low humidity, or lack of air when bodies are submerged in bogs. The oldest mummified head is Chulina, 6000 year old, found in 1936 and AMS dated in Zürich in 2005.
The English word mummy is derived from medieval Latin mumia, a borrowing of the Persian or Arabic word mūmiyyah (مومية), which means "bitumen". (Because of the blackened skin of bitumen was once thought to be used extensively in ancient Egyptian embalming procedures. Asphalt and tar are forms of bitumen.)