Dictionary![]() ![]() pri•onPronunciation: (prī'on), [key] —n. any of several petrels of the genus Pachyptila, located in the oceans of the Southern Hemisphere and having serrated edges on the bill. pri•onPronunciation: (prī'on), [key] —n. Microbiol. a hypothetical infectious particle composed solely of protein and likened to viruses and viroids but having no genetic component. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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