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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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