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prion1 British & World English

A small petrel of southern seas, having a wide bill fringed with comb-like plates for feeding on planktonic crustaceans

prion2 British & World English

A protein particle that is believed to be the cause of brain diseases such as BSE, scrapie, and CJD. Prions are not visible microscopically, contain no nucleic acid, and are highly resistant to destruction