| penicillamine | (noun) a drug (trade name Cuprimine) used to treat heavy metal poisoning and Wilson's disease and severe arthritis | Synonyms: Cuprimine |
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| penicillin | (noun) any of various antibiotics obtained from Penicillium molds (or produced synthetically) and used in the treatment of various infections and diseases | - |
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| penicillinase | (noun) enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic | Synonyms: beta-lactamase |
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| peninsula | (noun) a large mass of land projecting into a body of water | - |
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| penis | (noun) the male sex organ | Synonyms: member, phallus |
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| penitence | (noun) remorse for your past conduct | Synonyms: penance, repentance |
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| penitent | (noun) (Roman Catholic Church) a person who repents for wrongdoing (a Roman Catholic may be admitted to penance under the direction of a confessor) | - |
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| penitentiary | (noun) a correctional institution for those convicted of major crimes | Synonyms: pen |
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