| antineutrino | (noun) the antiparticle of a neutrino | - |
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| antineutron | (noun) the antiparticle of a neutron | - |
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| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| deuteranopia | (noun) dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red | Synonyms: Daltonism, green-blindness |
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| deuterium | (noun) an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) | Synonyms: heavy hydrogen |
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| deuteron | (noun) the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators | - |
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| deutzia | (noun) any of various shrubs of the genus Deutzia having usually toothed opposite leaves and shredding bark and white or pink flowers in loose terminal clusters | - |
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| eutectic | (noun) a mixture of substances having a minimum melting point | - |
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| euthanasia | (noun) the act of killing someone painlessly (especially someone suffering from an incurable illness) | Synonyms: mercy killing |
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| euthenics | (noun) the study of methods of improving human well-being and efficient functioning by improving environmental conditions | - |
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| eutherian | (noun) mammals having a placenta; all mammals except monotremes and marsupials | Synonyms: eutherian mammal, placental, placental mammal |
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| eutrophication | (noun) excessive nutrients in a lake or other body of water, usually caused by runoff of nutrients (animal waste, fertilizers, sewage) from the land, which causes a dense growth of plant life; the decomposition of the plants depletes the supply of oxygen, leading to the death of animal life | - |
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| hermeneutics | (noun) the branch of theology that deals with principles of exegesis | - |
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| lieutenancy | (noun) the position of a lieutenant | - |
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| lieutenant | (noun) an officer in a police force | Synonyms: police lieutenant |
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| (noun) a commissioned military officer | - |
| (noun) an assistant with power to act when his superior is absent | Synonyms: deputy |
| (noun) an officer holding a commissioned rank in the United States Navy or the United States Coast Guard; below lieutenant commander and above lieutenant junior grade | - |
| neuter | (noun) a gender that refers chiefly (but not exclusively) to inanimate objects (neither masculine nor feminine) | - |
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| neutering | (noun) the sterilization of an animal | Synonyms: altering, fixing |
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| neutral | (noun) one who does not side with any party in a war or dispute | - |
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| 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 |
| 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 |
| 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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| pharmaceutic | (noun) drug or medicine that is prepared or dispensed in pharmacies and used in medical treatment | Synonyms: pharmaceutical |
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| pharmaceutical | (noun) drug or medicine that is prepared or dispensed in pharmacies and used in medical treatment | Synonyms: pharmaceutic |
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| pharmaceutics | (noun) the art and science of preparing and dispensing drugs and medicines | Synonyms: pharmacy |
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| propaedeutic | (noun) a course that provides an introduction to an art or science (or to more advanced study generally) | Synonyms: propaedeutics |
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| 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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| psychotherapeutics | (noun) the branch of psychiatry concerned with psychological methods | Synonyms: mental hygiene, psychotherapy |
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| radiopharmaceutical | (noun) pharmaceutical consisting of a radioactive compound used in radiation therapy | - |
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| sleuth | (noun) a detective who follows a trail | Synonyms: sleuthhound |
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| sleuthhound | (noun) a breed of large powerful hound of European origin having very acute smell and used in tracking | Synonyms: bloodhound |
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| (noun) a detective who follows a trail | Synonyms: sleuth |
| sleuthing | (noun) a police investigation to determine the perpetrator | Synonyms: detecting, detection, detective work |
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| sublieutenant | (noun) an officer ranking next below a lieutenant | - |
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| therapeutic | (noun) a medicine or therapy that cures disease or relieve pain | Synonyms: curative, cure, remedy |
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| therapeutics | (noun) branch of medicine concerned with the treatment of disease | - |
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