what is a prion
Definition of PRION. : any of several protein particles that are abnormal forms of normal cellular proteins, that lack nucleic acid, and that in mammals have been implicated as the cause of prion diseases when accumulated in the mammalian brain. any of several protein particles that are abnormal forms of normal cellular proteins, that lack nucleic acid, and that in mammals have been implicated as the cause of prion diseases when accumulated in the mammalian brain.