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English definition of “prion”

prion

noun [C]     /ˈpraɪ.ɒn/ US  /-ɑːn/ specialized
a small piece of protein that is thought to cause certain brain diseases, such as BSE and CJDBacteria, moulds, germs and viruses
(Definition of prion noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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