| anoperineal | (adjective) relating to the anus and surrounding perineum | - |
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| aperient | (adjective) mildly laxative | - |
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| (noun) a purging medicine; stimulates evacuation of the bowels | Synonyms: cathartic, physic, purgative |
| aperiodic | (adjective) not recurring at regular intervals | Synonyms: nonperiodic |
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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 | - |
| (verb) undergo | Synonyms: have |
| (verb) have firsthand knowledge of states, situations, emotions, or sensations | Synonyms: know, live |
| (verb) undergo an emotional sensation or be in a particular state of mind | Synonyms: feel |
| (verb) go through (mental or physical states or experiences) | Synonyms: get, have, receive |
| (verb) undergo or live through a difficult experience | Synonyms: go through, see |
| experienced | (adjective) having experience; having knowledge or skill from observation or participation | Synonyms: experient |
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| experient | (adjective) having experience; having knowledge or skill from observation or participation | Synonyms: experienced |
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| experiential | (adjective) relating to or resulting from experience | - |
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| (adjective) derived from experience or the experience of existence | Synonyms: existential |
| 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 |
| (verb) to conduct a test or investigation | - |
| (verb) try something new, as in order to gain experience | Synonyms: try out |
| experimental | (adjective) relating to or based on experiment | - |
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| (adjective) relying on observation or experiment | Synonyms: data-based, observational |
| (adjective) of the nature of or undergoing an experiment | - |
| experimentalism | (noun) an orientation that favors experimentation and innovation | - |
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| (noun) an empirical doctrine that advocates experimental principles | - |
| experimentally | (adverb) in an experimental fashion | Synonyms: by experimentation, through an experiment |
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| 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 | (adjective) befitting or belonging to an emperor or empress | - |
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| (adjective) relating to or associated with an empire | - |
| (adjective) of or belonging to the British Imperial System of weights and measures | - |
| (adjective) belonging to or befitting a supreme ruler | Synonyms: majestic, purple, regal, royal |
| (noun) a piece of luggage carried on top of a coach | - |
| (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 | (adjective) of or relating to imperialism | Synonyms: imperialistic |
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| (noun) a believer in imperialism | - |
| imperialistic | (adjective) of or relating to imperialism | Synonyms: imperialist |
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| imperially | (adverb) in an imperial manner | - |
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| imperialness | (noun) The quality of being related to an empire, emperor, or empress. | - |
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| imperil | (verb) pose a threat to; present a danger to | Synonyms: endanger, jeopardise, jeopardize, menace, peril, threaten |
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| imperious | (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: disdainful, haughty, lordly, overbearing, prideful, sniffy, supercilious, swaggering |
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| imperiously | (adverb) in an imperious manner | - |
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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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| imperishable | (adjective) not perishable | - |
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| (adjective) lasting a long time | Synonyms: abiding, enduring |
| 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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| inexperienced | (adjective) lacking practical experience or training | Synonyms: inexperient |
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| inexperient | (adjective) lacking practical experience or training | Synonyms: inexperienced |
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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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| nonperiodic | (adjective) not recurring at regular intervals | Synonyms: aperiodic |
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| pampering | (adjective) gratifying tastes, appetites, or desires | - |
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| (noun) the act of indulging or gratifying a desire | Synonyms: humoring, humouring, indulgence, indulging |
| 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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| pauperise | (verb) reduce to beggary | Synonyms: beggar, pauperize |
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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 |
| pauperize | (verb) reduce to beggary | Synonyms: beggar, pauperise |
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| 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 | - |
| perianal | (adjective) around the anus | - |
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| 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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| pericardiac | (adjective) located around the heart or relating to or affecting the pericardium | Synonyms: pericardial |
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| pericardial | (adjective) located around the heart or relating to or affecting the pericardium | Synonyms: pericardiac |
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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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| perigonal | (adjective) of or relating to a perigone | - |
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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 |
| (verb) put in a dangerous, disadvantageous, or difficult position | Synonyms: endanger, expose, queer, scupper |
| (verb) pose a threat to; present a danger to | Synonyms: endanger, imperil, jeopardise, jeopardize, menace, threaten |
| perilous | (adjective) fraught with danger | Synonyms: parlous, precarious, touch-and-go |
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| perilously | (adverb) in a dangerous manner | Synonyms: dangerously, hazardously |
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| 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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| perinasal | (adjective) near the nose | Synonyms: perirhinal |
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| perinatal | (adjective) occurring during the period around birth (5 months before and 1 month after) | - |
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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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| perineal | (adjective) of or relating to the perineum | - |
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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 | - |
| periodic | (adjective) happening or recurring at regular intervals | Synonyms: periodical |
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| (adjective) recurring or reappearing from time to time | Synonyms: occasional |
| periodical | (adjective) happening or recurring at regular intervals | Synonyms: periodic |
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| (noun) a publication that appears at fixed intervals | - |
| periodically | (adverb) in a sporadic manner | Synonyms: sporadically |
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| periodicity | (noun) the quality of recurring at regular intervals | Synonyms: cyclicity |
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| periodontal | (adjective) of or relating to or involving or practicing periodontics | Synonyms: periodontic |
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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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| periodontic | (adjective) of or relating to or involving or practicing periodontics | Synonyms: periodontal |
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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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