| nortriptyline | (noun) a tricyclic antidepressant drug (trade name Pamelor) used along with psychotherapy to treat dysthymic depression; may interact dangerously if taken with other drugs | Synonyms: Pamelor |
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| nostril | (noun) either one of the two external openings to the nasal cavity in the nose | Synonyms: anterior naris |
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| nostrum | (noun) patent medicine whose efficacy is questionable | - |
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| (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: catholicon, cure-all, panacea |
| nutria | (noun) aquatic South American rodent resembling a small beaver; bred for its fur | Synonyms: coypu, Myocastor coypus |
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| nutrient | (noun) any substance that can be metabolized by an animal to give energy and build tissue | Synonyms: food |
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| (noun) any substance (such as a chemical element or inorganic compound) that can be taken in by a green plant and used in organic synthesis | - |
| nutriment | (noun) a source of materials to nourish the body | Synonyms: aliment, alimentation, nourishment, nutrition, sustenance, victuals |
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| nutrition | (noun) the scientific study of food and drink (especially in humans) | - |
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| (noun) a source of materials to nourish the body | Synonyms: aliment, alimentation, nourishment, nutriment, sustenance, victuals |
| (noun) (physiology) the organic process of nourishing or being nourished; the processes by which an organism assimilates food and uses it for growth and maintenance | - |
| nutritionist | (noun) a specialist in the study of nutrition | - |
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| nutritiousness | (noun) the quality of being nourishing and promoting healthy growth | Synonyms: nutritiveness |
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| nutritiveness | (noun) the quality of being nourishing and promoting healthy growth | Synonyms: nutritiousness |
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| obstetrician | (noun) a physician specializing in obstetrics | Synonyms: accoucheur |
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| obstetrics | (noun) the branch of medicine dealing with childbirth and care of the mother | Synonyms: midwifery, OB, tocology |
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| obstreperousness | (noun) noisy defiance | - |
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| obstructer | (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstruction, obstructor |
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| (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructionist, obstructor, resister, thwarter |
| obstruction | (noun) getting in someone's way | - |
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| (noun) the act of obstructing | - |
| (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstructer, obstructor |
| (noun) something immaterial that stands in the way and must be circumvented or surmounted | Synonyms: obstacle |
| (noun) the physical condition of blocking or filling a passage with an obstruction | Synonyms: blockage |
| obstructionism | (noun) deliberate interference | - |
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| obstructionist | (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructor, resister, thwarter |
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| obstructor | (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstructer, obstruction |
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| (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructionist, resister, thwarter |
| obstruent | (noun) a consonant that is produced with a partial or complete blockage of the airflow from the lungs through the nose or mouth | - |
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| obtrusiveness | (noun) an unwelcome conspicuousness | - |
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| octroi | (noun) a tax on various goods brought into a town | - |
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| oestradiol | (noun) the most powerful female hormone that occurs naturally; synthesized and used to treat estrogen deficiency and breast cancer | Synonyms: estradiol |
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| oestriol | (noun) a naturally occurring estrogenic hormone; a synthetic form is used to treat estrogen deficiency | Synonyms: estriol |
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| oestrogen | (noun) a general term for female steroid sex hormones that are secreted by the ovary and responsible for typical female sexual characteristics | Synonyms: estrogen |
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| oestrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: estrone, Estronol, theelin |
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| oestrus | (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | Synonyms: estrus, heat, rut |
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| ommastrephes | (noun) extremely active cylindrical squid with short strong arms and large rhombic terminal fins | - |
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| ophiolatry | (noun) the worship of snakes | Synonyms: serpent-worship |
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| optometrist | (noun) a person skilled in testing for defects of vision in order to prescribe corrective glasses | Synonyms: oculist |
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| optometry | (noun) the practice of an optometrist | - |
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| orchestra | (noun) seating on the main floor in a theater | - |
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| (noun) a musical organization consisting of a group of instrumentalists including string players | - |
| orchestration | (noun) the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments | Synonyms: instrumentation |
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| (noun) an arrangement of events that attempts to achieve a maximum effect | - |
| (noun) an arrangement of a piece of music for performance by an orchestra or band | - |
| orchestrator | (noun) an arranger who writes for orchestras | - |
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| osteodystrophy | (noun) defective bone development; usually attributable to renal disease or to disturbances in calcium and phosphorus metabolism | - |
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| osteopetrosis | (noun) an inherited disorder characterized by an increase in bone density; in severe forms the bone marrow cavity may be obliterated | Synonyms: Albers-Schonberg disease, marble bones disease |
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| osteostracan | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: cephalaspid |
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| ostracism | (noun) the act of excluding someone from society by general consent | - |
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| (noun) the state of being banished or ostracized (excluded from society by general consent) | Synonyms: banishment, Coventry |
| ostracod | (noun) tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell | Synonyms: mussel shrimp, seed shrimp |
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| ostracoderm | (noun) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic | - |
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| ostrich | (noun) fast-running African flightless bird with two-toed feet; largest living bird | Synonyms: Struthio camelus |
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| (noun) a person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand) | - |
| outrage | (noun) the act of scandalizing | Synonyms: scandalisation, scandalization |
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| (noun) a wantonly cruel act | - |
| (noun) a disgraceful event | Synonyms: scandal |
| (noun) a feeling of righteous anger | Synonyms: indignation |
| outrageousness | (noun) the quality of being outrageous | Synonyms: enormity |
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| (noun) excessive excess | Synonyms: exorbitance |
| outreach | (noun) the act of reaching out | - |
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| outrider | (noun) an escort who rides ahead (as a member of the vanguard) | - |
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| outrigger | (noun) a stabilizer for a canoe; spars attach to a shaped log or float parallel to the hull | - |
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| outstroke | (noun) the stroke of an engine piston moving toward the crankshaft | - |
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| overstrain | (noun) too much strain | - |
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| oxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: hydroxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| paediatrician | (noun) a specialist in the care of babies | Synonyms: baby doctor, pediatrician, pediatrist |
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| paediatrics | (noun) the branch of medicine concerned with the treatment of infants and children | Synonyms: pediatric medicine, pediatrics, pedology |
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| pageantry | (noun) an elaborate representation of scenes from history etc; usually involves a parade with rich costumes | Synonyms: pageant |
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| (noun) a rich and spectacular ceremony | Synonyms: pageant |
| palaestra | (noun) a public place in ancient Greece or Rome devoted to the training of wrestlers and other athletes | Synonyms: palestra |
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| paleostriatum | (noun) the inner pale yellow part of the lenticular nucleus | Synonyms: globus pallidus, pallidum |
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| palestra | (noun) a public place in ancient Greece or Rome devoted to the training of wrestlers and other athletes | Synonyms: palaestra |
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| palmistry | (noun) telling fortunes by lines on the palm of the hand | Synonyms: chirology, chiromancy, palm reading |
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| paltriness | (noun) worthlessness due to insignificance | Synonyms: sorriness |
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| pantry | (noun) a small storeroom for storing foods or wines | Synonyms: buttery, larder |
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| pantryman | (noun) a manservant (usually the head servant of a household) who has charge of wines and the table | Synonyms: butler |
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| parametritis | (noun) inflammation of connective tissue adjacent to the uterus | - |
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| paratrooper | (noun) a soldier in the paratroops | Synonyms: para |
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| paratroops | (noun) infantry trained and equipped to parachute | - |
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| pargetry | (noun) ornamental plasterwork | Synonyms: pargeting, pargetting |
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| parquetry | (noun) a patterned wood inlay used to cover a floor | Synonyms: parqueterie |
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| partridge | (noun) small Old World gallinaceous game birds | - |
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| (noun) a popular North American game bird; named for its call | Synonyms: bobwhite, bobwhite quail |
| (noun) valued as a game bird in eastern United States and Canada | Synonyms: Bonasa umbellus, ruffed grouse |
| (noun) heavy-bodied small-winged South American game bird resembling a gallinaceous bird but related to the ratite birds | Synonyms: tinamou |
| (noun) flesh of either quail or grouse | - |
| partridgeberry | (noun) creeping woody plant of eastern North America with shiny evergreen leaves and scarlet berries | Synonyms: boxberry, Mitchella repens, twinberry |
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| pastrami | (noun) highly seasoned cut of smoked beef | - |
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| pastry | (noun) any of various baked foods made of dough or batter | - |
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| (noun) a dough of flour and water and shortening | Synonyms: pastry dough |
| patrial | (noun) a person who has the right to be considered legally a British citizen (by virtue of the birth of a parent or grandparent) | - |
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| patriarch | (noun) the male head of family or tribe | Synonyms: paterfamilias |
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| (noun) any of the early biblical characters regarded as fathers of the human race | - |
| (noun) title for the heads of the Eastern Orthodox Churches (in Istanbul and Alexandria and Moscow and Jerusalem) | - |
| (noun) a man who is older and higher in rank than yourself | - |
| patriarchate | (noun) a form of social organization in which a male is the family head and title is traced through the male line | Synonyms: patriarchy |
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| (noun) the jurisdiction of a patriarch | - |
| patriarchy | (noun) a form of social organization in which a male is the family head and title is traced through the male line | Synonyms: patriarchate |
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| patrician | (noun) a member of the aristocracy | Synonyms: aristocrat, blue blood |
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| (noun) a person of refined upbringing and manners | - |
| patriciate | (noun) members of the patrician class. | - |
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| patricide | (noun) the murder of your father | - |
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| (noun) a person who murders their father | - |
| patrikin | (noun) one related on the father's side | Synonyms: agnate, patrilineal kin, patrilineal sib, patrisib |
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| patrilineage | (noun) line of descent traced through the paternal side of the family | Synonyms: agnation |
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| patrimony | (noun) an inheritance coming by right of birth (especially by primogeniture) | Synonyms: birthright |
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| (noun) a church endowment | - |
| patriot | (noun) one who loves and defends his or her country | Synonyms: nationalist |
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| patrioteer | (noun) an extreme bellicose nationalist | Synonyms: chauvinist, flag-waver, hundred-percenter, jingo, jingoist |
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| patriotism | (noun) love of country and willingness to sacrifice for it | Synonyms: nationalism |
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| patrisib | (noun) one related on the father's side | Synonyms: agnate, patrikin, patrilineal kin, patrilineal sib |
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| patristics | (noun) the study of the lives, writings, and doctrines of the Church Fathers | Synonyms: patrology |
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| (noun) the writings of the early Church Fathers | Synonyms: patrology |
| patrol | (noun) the activity of going around or through an area at regular intervals for security purposes | - |
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| (noun) a detachment used for security or reconnaissance | - |
| (noun) a group that goes through a region at regular intervals for the purpose of security | - |
| patroller | (noun) someone on patrol duty; an individual or a member of a group that patrols an area | - |
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| patrolman | (noun) a policeman who patrols a given region | Synonyms: flatfoot |
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| patrology | (noun) the study of the lives, writings, and doctrines of the Church Fathers | Synonyms: patristics |
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| (noun) the writings of the early Church Fathers | Synonyms: patristics |
| patron | (noun) a regular customer | Synonyms: frequenter |
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| (noun) someone who supports or champions something | Synonyms: sponsor, supporter |
| (noun) the proprietor of an inn | - |
| patronage | (noun) the act of providing approval and support | Synonyms: backing, backup, championship |
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| (noun) (politics) granting favors or giving contracts or making appointments to office in return for political support | - |
| (noun) the business given to a commercial establishment by its customers | Synonyms: trade |
| (noun) a communication that indicates lack of respect by patronizing the recipient | Synonyms: condescension, disdain |
| (noun) customers collectively | Synonyms: business, clientele |
| patroness | (noun) a woman who is a patron or the wife of a patron | Synonyms: patronne |
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| patronne | (noun) a woman who is a patron or the wife of a patron | Synonyms: patroness |
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| patronym | (noun) a family name derived from name of your father or a paternal ancestor (especially with an affix (such as -son in English or O'- in Irish) added to the name of your father or a paternal ancestor) | Synonyms: patronymic |
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| patronymic | (noun) a family name derived from name of your father or a paternal ancestor (especially with an affix (such as -son in English or O'- in Irish) added to the name of your father or a paternal ancestor) | Synonyms: patronym |
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| peasantry | (noun) the class of peasants | - |
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| pedantry | (noun) an ostentatious and inappropriate display of learning | - |
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| pedestrian | (noun) a person who travels by foot | Synonyms: footer, walker |
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| pediatrician | (noun) a specialist in the care of babies | Synonyms: baby doctor, paediatrician, pediatrist |
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| pediatrics | (noun) the branch of medicine concerned with the treatment of infants and children | Synonyms: paediatrics, pediatric medicine, pedology |
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| pediatrist | (noun) a specialist in the care of babies | Synonyms: baby doctor, paediatrician, pediatrician |
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| pelvimetry | (noun) measurement of the dimensions of the bony birth canal (to determine whether vaginal birth is possible) | - |
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| penetrability | (noun) the quality of being penetrable (by people or light or missiles etc.) | Synonyms: perviousness |
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