| neuroticism | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neurosis, psychoneurosis |
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| neurotoxic | (adjective) poisonous to nerves or nerve cells | - |
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| neurotoxin | (noun) any toxin that affects neural tissues | Synonyms: neurolysin |
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| neurotransmitter | (noun) a neurochemical that transmits nerve impulses across a synapse | - |
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| neurotropic | (adjective) (of a virus, toxin, or chemical) tending to attack or affect the nervous system preferentially | - |
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| neurotropism | (noun) an affinity for neural tissues | - |
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| neuter | (adjective) neither male nor female (of grammatical gender) | - |
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| (adjective) having no or imperfectly developed or nonfunctional sex organs | Synonyms: sexless |
| (noun) a gender that refers chiefly (but not exclusively) to inanimate objects (neither masculine nor feminine) | - |
| (verb) remove the ovaries of | Synonyms: alter, castrate, spay |
| neutered | (adjective) having testicles or ovaries removed | Synonyms: altered |
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| neutering | (noun) the sterilization of an animal | Synonyms: altering, fixing |
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| neutral | (adjective) having no hue | Synonyms: achromatic |
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| (adjective) possessing no distinctive quality or characteristics | - |
| (adjective) lacking distinguishing quality or characteristics | - |
| (adjective) not supporting or favoring either side in a war, dispute, or contest | - |
| (adjective) having no personal preference | Synonyms: impersonal |
| (adjective) having no net electric charge | Synonyms: electroneutral |
| (adjective) having only a limited ability to react chemically; chemically inactive | Synonyms: indifferent, inert |
| (noun) one who does not side with any party in a war or dispute | - |
| neutralisation | (noun) action intended to nullify the effects of some previous action | Synonyms: counteraction, neutralization |
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| (noun) action intended to keep a country politically neutral or exclude it from a possible war | Synonyms: neutralization |
| (noun) (euphemism) the removal of a threat by killing or destroying it (especially in a covert operation or military operation) | Synonyms: neutralization |
| (noun) a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water | Synonyms: neutralisation reaction, neutralization, neutralization reaction |
| neutralise | (verb) make chemically neutral | Synonyms: neutralize |
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| (verb) make ineffective by counterbalancing the effect of | Synonyms: negate, neutralize, nullify |
| (verb) make incapable of military action | Synonyms: neutralize |
| (verb) get rid of (someone who may be a threat) by killing | Synonyms: do in, knock off, liquidate, neutralize, waste |
| neutralised | (adjective) made neutral in some respect; deprived of distinctive characteristics | Synonyms: neutralized |
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| neutralism | (noun) a policy of neutrality or nonalignment in international affairs | - |
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| neutralist | (noun) an advocate of neutrality in international affairs | - |
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| neutrality | (noun) nonparticipation in a dispute or war | - |
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| (noun) pH value of 7 | - |
| (noun) tolerance attributable to a lack of involvement | Synonyms: disinterest |
| neutralization | (noun) action intended to nullify the effects of some previous action | Synonyms: counteraction, neutralisation |
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| (noun) action intended to keep a country politically neutral or exclude it from a possible war | Synonyms: neutralisation |
| (noun) (euphemism) the removal of a threat by killing or destroying it (especially in a covert operation or military operation) | Synonyms: neutralisation |
| (noun) a chemical reaction in which an acid and a base interact with the formation of a salt; with strong acids and bases the essential reaction is the combination of hydrogen ions with hydroxyl ions to form water | Synonyms: neutralisation, neutralisation reaction, neutralization reaction |
| neutralize | (verb) make chemically neutral | Synonyms: neutralise |
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| (verb) make ineffective by counterbalancing the effect of | Synonyms: negate, neutralise, nullify |
| (verb) make incapable of military action | Synonyms: neutralise |
| (verb) get rid of (someone who may be a threat) by killing | Synonyms: do in, knock off, liquidate, neutralise, waste |
| (verb) make politically neutral and thus inoffensive | - |
| (verb) oppose and mitigate the effects of by contrary actions | Synonyms: counteract, counterbalance, countervail |
| neutralized | (adjective) made neutral in some respect; deprived of distinctive characteristics | Synonyms: neutralised |
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| neutrino | (noun) an elementary, electrically neutral particle with a very small mass | - |
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| neutron | (noun) an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus | - |
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| neutropenia | (noun) leukopenia in which the decrease is primarily in number of neutrophils (the chief phagocytic leukocyte) | - |
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| neutrophil | (noun) the chief phagocytic leukocyte; stains with either basic or acid dyes | Synonyms: neutrophile |
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| neutrophile | (noun) the chief phagocytic leukocyte; stains with either basic or acid dyes | Synonyms: neutrophil |
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| nucleus | (noun) a part of the cell containing DNA and RNA and responsible for growth and reproduction | Synonyms: cell nucleus, karyon |
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| (noun) any histologically identifiable mass of neural cell bodies in the brain or spinal cord | - |
| (noun) the central structure of the lens that is surrounded by the cortex | Synonyms: lens nucleus |
| (noun) a small group of indispensable persons or things | Synonyms: core, core group |
| (noun) the positively charged dense center of an atom | - |
| (noun) (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail | - |
| oeuvre | (noun) the total output of a writer or artist (or a substantial part of it) | Synonyms: body of work, work |
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| outmaneuver | (verb) defeat by more skillful maneuvering | Synonyms: outmanoeuvre, outsmart |
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| outmanoeuvre | (verb) defeat by more skillful maneuvering | Synonyms: outmaneuver, outsmart |
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| pasteurellosis | (noun) an acute infectious disease characterized by pneumonia and blood infection | Synonyms: hemorrhagic septicemia |
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| pasteurisation | (noun) partial sterilization of foods at a temperature that destroys harmful microorganisms without major changes in the chemistry of the food | Synonyms: pasteurization |
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| pasteurise | (verb) heat food in order to kill harmful microorganisms | Synonyms: pasteurize |
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| pasteurised | (adjective) having been subjected to pasteurization in order to halt fermentation | Synonyms: pasteurized |
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| pasteuriser | (noun) an apparatus for pasteurizing substances (especially milk). | Synonyms: pasteurizer |
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| pasteurization | (noun) partial sterilization of foods at a temperature that destroys harmful microorganisms without major changes in the chemistry of the food | Synonyms: pasteurisation |
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| pasteurize | (verb) heat food in order to kill harmful microorganisms | Synonyms: pasteurise |
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| pasteurized | (adjective) having been subjected to pasteurization in order to halt fermentation | Synonyms: pasteurised |
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| pasteurizer | (noun) an apparatus for pasteurizing substances (especially milk). | Synonyms: pasteuriser |
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| perineum | (noun) the general region between the anus and the genital organs | - |
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| perineurium | (noun) the sheath of connective tissue that covers a bundle of nerve fibers | - |
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| periosteum | (noun) a dense fibrous membrane covering the surface of bones (except at their extremities) and serving as an attachment for tendons and muscles; contains nerves and blood vessels that nourish the enclosed bone | - |
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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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| peroneus | (noun) muscle of the lower leg that is involved in moving the foot | - |
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| petroleum | (noun) a dark oil consisting mainly of hydrocarbons | Synonyms: crude, crude oil, fossil oil, oil, rock oil |
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| pharmaceutic | (adjective) of or relating to pharmacy or pharmacists | Synonyms: pharmaceutical |
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| (noun) drug or medicine that is prepared or dispensed in pharmacies and used in medical treatment | Synonyms: pharmaceutical |
| pharmaceutical | (adjective) of or relating to pharmacy or pharmacists | Synonyms: pharmaceutic |
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| (adjective) of or relating to drugs used in medical treatment | - |
| (noun) drug or medicine that is prepared or dispensed in pharmacies and used in medical treatment | Synonyms: pharmaceutic |
| pharmaceutics | (noun) the art and science of preparing and dispensing drugs and medicines | Synonyms: pharmacy |
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| physiotherapeutic | (adjective) of or relating to or used in physical therapy | - |
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| pileup | (noun) multiple collisions of vehicles | - |
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| pileus | (noun) a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom | Synonyms: cap |
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| pleura | (noun) the thin serous membrane around the lungs and inner walls of the chest | - |
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| pleural | (adjective) of or relating to the pleura or the walls of the thorax | - |
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| pleuralgia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: costalgia, pleurodynia |
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| pleurisy | (noun) inflammation of the pleura of the lungs (especially the parietal layer) | - |
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| pleurocarp | (noun) a moss having the archegonium or antheridium on a short side branch rather than the main stalk | Synonyms: pleurocarpous moss |
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| pleurocarpous | (adjective) (of mosses) having the archegonia on short lateral branches | - |
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| pleurodont | (noun) an animal having teeth fused with the inner surface of the alveolar ridge without sockets | - |
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| pleurodynia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: costalgia, pleuralgia |
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| pleuropneumonia | (noun) pleurisy and pneumonia | - |
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| pleurothallis | (noun) any of numerous small tufted orchids of the genus Pleurothallis having leathery to fleshy leaves and racemes of 1 to many small flowers | - |
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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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| polyneuritis | (noun) inflammation of many or all of the peripheral nerves (as in leprosy) | Synonyms: multiple neuritis |
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| poseur | (noun) a person who habitually pretends to be something he is not | Synonyms: poser |
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| poseuse | (noun) a woman poseur | - |
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| pronucleus | (noun) the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote | - |
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| propaedeutic | (adjective) preceding and preparing for something | Synonyms: preparative, preparatory |
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| (noun) a course that provides an introduction to an art or science (or to more advanced study generally) | Synonyms: propaedeutics |
| propaedeutics | (noun) a course that provides an introduction to an art or science (or to more advanced study generally) | Synonyms: propaedeutic |
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| provocateur | (noun) a secret agent who incites suspected persons to commit illegal acts | Synonyms: agent provocateur |
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| pseud | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseudo, role player, sham, shammer |
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| pseudo | (adjective) (often used in combination) not genuine but having the appearance of | - |
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| (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseud, role player, sham, shammer |
| pseudobulb | (noun) a solid bulblike enlargement of the stem of some orchids | - |
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| pseudocarp | (noun) fruit containing much fleshy tissue besides that of the ripened ovary; as apple or strawberry | Synonyms: accessory fruit |
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| pseudocyesis | (noun) physiological state in which a woman exhibits symptoms of pregnancy but is not pregnant | Synonyms: false pregnancy |
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| pseudoephedrine | (noun) poisonous crystalline alkaloid occurring with ephedrine and isomorphic with it | - |
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| pseudohallucination | (noun) an image vivid enough to be a hallucination but recognized as unreal | - |
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| pseudohermaphrodite | (adjective) having internal reproductive organs of one sex and external sexual characteristics of the other sex | Synonyms: pseudohermaphroditic |
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| (noun) someone having external genitalia of one sex and internal sex organs of the other sex; not a true hermaphrodite because there is no ambiguity in the sex of the external genitalia and hence no question about gender at birth | - |
| pseudohermaphroditic | (adjective) having internal reproductive organs of one sex and external sexual characteristics of the other sex | Synonyms: pseudohermaphrodite |
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| pseudohermaphroditism | (noun) congenital condition in which a person has external genitalia of one sex and internal sex organs of the other sex | - |
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| pseudomonad | (noun) bacteria usually producing greenish fluorescent water-soluble pigment; some pathogenic for plants and animals | - |
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| pseudonym | (noun) a fictitious name used when the person performs a particular social role | Synonyms: anonym, nom de guerre |
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| pseudonymous | (adjective) bearing or identified by an assumed (often pen) name | - |
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| pseudoperipteral | (adjective) having columniation completely circling an area of the structure | Synonyms: peristylar |
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| pseudophloem | (noun) false phloem | - |
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| pseudopod | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopodium |
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| pseudopodium | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopod |
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| pseudoprostyle | (adjective) marked by columniation having free columns in a portico only across the opening to the structure | Synonyms: prostyle |
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