| prion | (noun) (microbiology) an infectious protein particle similar to a virus but lacking nucleic acid; thought to be the agent responsible for scrapie and other degenerative diseases of the nervous system | - |
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| prior | (noun) the head of a religious order; in an abbey the prior is next below the abbot | - |
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| prioress | (noun) the superior of a group of nuns | Synonyms: abbess, mother superior |
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| priority | (noun) preceding in time | Synonyms: antecedence, antecedency, anteriority, precedence, precedency |
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| (noun) status established in order of importance or urgency | Synonyms: precedence, precedency |
| priorship | (noun) the office of prior | - |
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| priory | (noun) religious residence in a monastery governed by a prior or a convent governed by a prioress | - |
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