| atheneum | (noun) a place where reading materials are available | Synonyms: athenaeum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: athenaeum |
| bronchopneumonia | (noun) pneumonia characterized by acute inflammation of the walls of the bronchioles | Synonyms: bronchial pneumonia |
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| corneum | (noun) the outermost layer of the epidermis consisting of dead cells that slough off | Synonyms: horny layer, stratum corneum |
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| ichneumon | (noun) northern African mongoose; in ancient times thought to devour crocodile eggs | Synonyms: Herpestes ichneumon |
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| perineum | (noun) the general region between the anus and the genital organs | - |
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| peritoneum | (noun) a transparent membrane that lines the abdominal cavity in mammals and covers most of the viscera | - |
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| pleuropneumonia | (noun) pleurisy and pneumonia | - |
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| pneumatic | (adjective) of or relating to or using air (or a similar gas) | - |
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| pneumatically | (adverb) in a pneumatic manner | - |
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| 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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| pneumococcal | (adjective) of or derived from or caused by bacteria of the genus pneumococcus | - |
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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 | (adjective) of or relating to or involving the lungs and stomach | - |
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| (adjective) of or relating to the vagus nerve | Synonyms: vagal |
| (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 |
| 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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| pneumonic | (adjective) relating to or affecting the lungs | Synonyms: pulmonary, pulmonic |
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| (adjective) pertaining to or characterized by or affected by pneumonia | - |
| 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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| succedaneum | (noun) (medicine) something that can be used as a substitute (especially any medicine that may be taken in place of another) | - |
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