| aperient | (noun) a purging medicine; stimulates evacuation of the bowels | Synonyms: cathartic, physic, purgative |
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| aperitif | (noun) alcoholic beverage taken before a meal as an appetizer | - |
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| asperity | (noun) something hard to endure | Synonyms: grimness, hardship, rigor, rigorousness, rigour, rigourousness, severeness, severity |
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| (noun) harshness of manner | Synonyms: sharpness |
| experience | (noun) the content of direct observation or participation in an event | - |
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| (noun) the accumulation of knowledge or skill that results from direct participation in events or activities | - |
| (noun) an event as apprehended | - |
| experiment | (noun) the act of conducting a controlled test or investigation | Synonyms: experimentation |
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| (noun) a venture at something new or different | - |
| (noun) the testing of an idea | Synonyms: experimentation |
| experimentalism | (noun) an orientation that favors experimentation and innovation | - |
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| (noun) an empirical doctrine that advocates experimental principles | - |
| experimentation | (noun) the act of conducting a controlled test or investigation | Synonyms: experiment |
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| (noun) the testing of an idea | Synonyms: experiment |
| experimenter | (noun) a research worker who conducts experiments | - |
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| (noun) a person who enjoys testing innovative ideas | - |
| haloperidol | (noun) tranquilizer (trade name Haldol) used to treat some psychotic disorders and Tourette's syndrome | Synonyms: Haldol |
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| hypericism | (noun) a severe dermatitis of herbivorous domestic animals attributable to photosensitivity from eating Saint John's wort | - |
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| hyperidrosis | (noun) excessive and profuse perspiration | Synonyms: hyperhidrosis, polyhidrosis |
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| hyperintelligence | (noun) Remarkable intelligence, intelligence at or above and beyond the level of a genius. | Synonyms: superintelligence |
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| imperial | (noun) a piece of luggage carried on top of a coach | - |
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| (noun) a small tufted beard worn by Emperor Napoleon III | Synonyms: imperial beard |
| imperialism | (noun) any instance of aggressive extension of authority | - |
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| (noun) a political orientation that advocates imperial interests | - |
| (noun) a policy of extending your rule over foreign countries | - |
| imperialist | (noun) a believer in imperialism | - |
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| imperialness | (noun) The quality of being related to an empire, emperor, or empress. | - |
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| imperiousness | (noun) the trait of being imperious and overbearing | Synonyms: domineeringness, overbearingness |
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| imperishability | (noun) the property of being resistant to decay | Synonyms: imperishableness, imperishingness |
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| imperishableness | (noun) the property of being resistant to decay | Synonyms: imperishability, imperishingness |
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| imperishingness | (noun) the property of being resistant to decay | Synonyms: imperishability, imperishableness |
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| imperium | (noun) supreme authority; absolute dominion | - |
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| (noun) the domain ruled by an emperor or empress; the region over which imperial dominion is exercised | Synonyms: empire |
| inexperience | (noun) lack of experience and the knowledge and understanding derived from experience | Synonyms: rawness |
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| meperidine | (noun) a synthetic narcotic drug (trade name Demerol) used to treat pain | Synonyms: Demerol, meperidine hydrochloride |
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| newspapering | (noun) journalism practiced for the newspapers | - |
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| pampering | (noun) the act of indulging or gratifying a desire | Synonyms: humoring, humouring, indulgence, indulging |
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| papering | (noun) the application of wallpaper | Synonyms: paperhanging |
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| pauperisation | (noun) the act of making someone poor | Synonyms: impoverishment, pauperization |
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| pauperism | (noun) a state of extreme poverty or destitution | Synonyms: indigence, need, pauperization, penury |
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| pauperization | (noun) the act of making someone poor | Synonyms: impoverishment, pauperisation |
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| (noun) a state of extreme poverty or destitution | Synonyms: indigence, need, pauperism, penury |
| pepperidge | (noun) columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall | Synonyms: black gum, Nyssa sylvatica, sour gum |
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| pepperiness | (noun) a hot spiciness | Synonyms: hotness |
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| peri | (noun) a beautiful and graceful girl | - |
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| (noun) (Persian folklore) a supernatural being descended from fallen angels and excluded from paradise until penance is done | - |
| perianth | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perigone, perigonium |
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| periapsis | (noun) (astronomy) the point in an orbit closest to the body being orbited | Synonyms: point of periapsis |
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| periarteritis | (noun) inflammation of the outer coat of an artery | - |
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| pericarditis | (noun) inflammation of the pericardium | - |
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| pericardium | (noun) a serous membrane with two layers that surrounds the heart | - |
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| pericarp | (noun) the ripened and variously modified walls of a plant ovary | Synonyms: seed vessel |
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| pericementoclasia | (noun) pus pocket formation around a tooth | - |
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| periclase | (noun) a white solid mineral that occurs naturally as periclase; a source of magnesium | Synonyms: magnesia, magnesium oxide |
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| peridinian | (noun) flagellate with a thick test composed of plates | - |
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| peridium | (noun) outer layer of the spore-bearing organ in many fungi | - |
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| peridot | (noun) a pale green variety of chrysolite; used as a gemstone | - |
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| peridotite | (noun) a dark coarse-grained igneous rock consisting principally of olivine | - |
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| perigee | (noun) periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth | - |
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| perigon | (noun) an angle of 360 degrees | Synonyms: round angle |
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| perigone | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigonium |
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| perigonium | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigone |
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| perihelion | (noun) periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun | - |
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| perijove | (noun) periapsis in orbit around Jupiter | - |
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| peril | (noun) a venture undertaken without regard to possible loss or injury | Synonyms: danger, risk |
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| (noun) a source of danger; a possibility of incurring loss or misfortune | Synonyms: endangerment, hazard, jeopardy, risk |
| (noun) a state of danger involving risk | Synonyms: riskiness |
| perilousness | (noun) the state of being dangerous | Synonyms: hazardousness |
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| perilune | (noun) periapsis in orbit around the moon | Synonyms: periselene |
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| perilymph | (noun) the bodily fluid that fills the space between the bony labyrinth and the membranous labyrinth of the inner ear | - |
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| perimeter | (noun) the size of something as given by the distance around it | Synonyms: circumference |
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| (noun) the boundary line or the area immediately inside the boundary | Synonyms: border, margin |
| (noun) a line enclosing a plane areas | - |
| perimysium | (noun) the sheath of connective tissue that covers a bundle of muscle fibers | - |
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| perinatologist | (noun) an obstetrician specializing in perinatology | - |
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| perinatology | (noun) the branch of obstetrics concerned with the anatomy and physiology and diagnosis and treatment of disorders of the mother and the fetus or newborn baby during late pregnancy and childbirth and the puerperium | - |
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| perineotomy | (noun) surgical incision into the perineum | - |
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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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| period | (noun) a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations | Synonyms: full point, full stop, point, stop |
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| (noun) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | Synonyms: catamenia, flow, menses, menstruation, menstruum |
| (noun) an amount of time | Synonyms: period of time, time period |
| (noun) the interval taken to complete one cycle of a regularly repeating phenomenon | - |
| (noun) a unit of geological time during which a system of rocks formed | Synonyms: geological period |
| (noun) the end or completion of something | - |
| (noun) (ice hockey) one of three divisions into which play is divided in hockey games | - |
| periodical | (noun) a publication that appears at fixed intervals | - |
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| periodicity | (noun) the quality of recurring at regular intervals | Synonyms: cyclicity |
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| periodontia | (noun) the branch of dentistry dealing with diseases of the gums and other structures around the teeth | Synonyms: periodontics |
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| periodontics | (noun) the branch of dentistry dealing with diseases of the gums and other structures around the teeth | Synonyms: periodontia |
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| periodontist | (noun) a dentist specializing in diseases of the gums and other structure surrounding the teeth | - |
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| periodontitis | (noun) a disease that attacks the gum and bone and around the teeth | Synonyms: periodontal disease |
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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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| peripatetic | (noun) a person who walks from place to place | - |
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| peripateticism | (noun) (philosophy) the philosophy of Aristotle that deals with logic and metaphysics and ethics and poetics and politics and natural science | Synonyms: Aristotelianism |
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| peripatus | (noun) any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms | Synonyms: onychophoran, velvet worm |
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| peripeteia | (noun) a sudden and unexpected change of fortune or reverse of circumstances (especially in a literary work) | Synonyms: peripetia, peripety |
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| peripetia | (noun) a sudden and unexpected change of fortune or reverse of circumstances (especially in a literary work) | Synonyms: peripeteia, peripety |
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| peripety | (noun) a sudden and unexpected change of fortune or reverse of circumstances (especially in a literary work) | Synonyms: peripeteia, peripetia |
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| peripheral | (noun) electronic equipment external to the circuit board that contains the CPU of a computer | Synonyms: computer peripheral, peripheral device |
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| periphery | (noun) the outside boundary or surface of something | Synonyms: fringe, outer boundary |
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| periphrasis | (noun) a style that involves indirect ways of expressing things | Synonyms: ambage, circumlocution |
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| periscope | (noun) an optical instrument that provides a view of an otherwise obstructed field | - |
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| periselene | (noun) periapsis in orbit around the moon | Synonyms: perilune |
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| perishability | (noun) unsatisfactoriness by virtue of being subject to decay or spoilage or destruction | Synonyms: perishableness |
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| perishable | (noun) food that will decay rapidly if not refrigerated | Synonyms: spoilable |
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| perishableness | (noun) unsatisfactoriness by virtue of being subject to decay or spoilage or destruction | Synonyms: perishability |
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| perisher | (noun) bounder | - |
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| perisperm | (noun) the nutritive tissue outside the sac containing the embryo in some seeds | - |
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| perissodactyl | (noun) placental mammals having hooves with an odd number of toes on each foot | Synonyms: odd-toed ungulate, perissodactyl mammal |
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| peristalsis | (noun) the process of wavelike muscle contractions of the alimentary tract that moves food along | Synonyms: vermiculation |
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| peristome | (noun) region around the mouth in various invertebrates | - |
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| (noun) (botany) fringe of toothlike appendages surrounding the mouth of a moss capsule | - |
| peristyle | (noun) a colonnade surrounding a building or enclosing a court | - |
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| perithecium | (noun) flask-shaped ascocarp | - |
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| perithelium | (noun) tissue layer around small blood vessels | - |
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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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| peritonitis | (noun) inflammation of the peritoneum | Synonyms: peritoneal inflammation |
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| periwig | (noun) a wig for men that was fashionable in the 17th and 18th centuries | Synonyms: peruke |
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| periwinkle | (noun) edible marine gastropod | Synonyms: winkle |
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| (noun) small edible marine snail; steamed in wine or baked | Synonyms: winkle |
| (noun) chiefly trailing poisonous plants with blue flowers | - |
| (noun) commonly cultivated Old World woody herb having large pinkish to red flowers | Synonyms: Cape periwinkle, Catharanthus roseus, cayenne jasmine, Madagascar periwinkle, old maid, red periwinkle, rose periwinkle, Vinca rosea |
| piperin | (noun) derived from pepper (especially black pepper); source of the hotness of black and white pepper | Synonyms: piperine |
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| piperine | (noun) derived from pepper (especially black pepper); source of the hotness of black and white pepper | Synonyms: piperin |
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| prosperity | (noun) the condition of prospering; having good fortune | Synonyms: successfulness |
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| (noun) an economic state of growth with rising profits and full employment | - |
| puerperium | (noun) time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved | - |
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| slipperiness | (noun) a slippery smoothness | Synonyms: slick, slickness, slip |
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| (noun) the quality of being a slippery rascal | Synonyms: rascality, shiftiness, trickiness |