Definition of prion noun from the Oxford Advanced Learner's Dictionary

 

prion

 noun
noun
BrE BrE//ˈpriːɒn//
 
; NAmE NAmE//ˈpriːɑːn//
 
(biology)
 
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a very small unit of protein that is believed to be the cause of brain diseases such as BSE, CJD and scrapie Word Origin 1980s: by rearrangement of elements from pro(teinaceous) in(fectious particle).
See the Oxford Advanced American Dictionary entry: prion