| pneumatics | (noun) the branch of mechanics that deals with the mechanical properties of gases | - |
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| pneumatophore | (noun) an air-filled root (submerged or exposed) that can function as a respiratory organ of a marsh or swamp plant | - |
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| pneumococcus | (noun) bacterium causing pneumonia in mice and humans | Synonyms: Diplococcus pneumoniae |
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| pneumoconiosis | (noun) chronic respiratory disease caused by inhaling metallic or mineral particles | Synonyms: pneumonoconiosis |
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| pneumocytosis | (noun) pneumonia occurring in infants or in persons with impaired immune systems (as AIDS victims) | Synonyms: interstitial plasma cell pneumonia, pneumocystis carinii pneumonia, pneumocystis pneumonia |
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| pneumoencephalogram | (noun) an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast | Synonyms: encephalogram |
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| pneumogastric | (noun) a mixed nerve that supplies the pharynx and larynx and lungs and heart and esophagus and stomach and most of the abdominal viscera | Synonyms: nervus vagus, pneumogastric nerve, tenth cranial nerve, vagus, vagus nerve, wandering nerve |
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| pneumonectomy | (noun) surgical removal of a lung (usually to treat lung cancer) | - |
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| pneumonia | (noun) respiratory disease characterized by inflammation of the lung parenchyma (excluding the bronchi) with congestion caused by viruses or bacteria or irritants | - |
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| pneumonitis | (noun) inflammation of the lungs; caused by a virus or an allergic reaction | - |
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| pneumonoconiosis | (noun) chronic respiratory disease caused by inhaling metallic or mineral particles | Synonyms: pneumoconiosis |
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| pneumothorax | (noun) abnormal presence of air in the pleural cavity resulting in the collapse of the lung; may be spontaneous (due to injury to the chest) or induced (as a treatment for tuberculosis) | - |
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