| perfectibility | (noun) the capability of becoming perfect | - |
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| perfection | (noun) the act of making something perfect | - |
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| (noun) an ideal instance; a perfect embodiment of a concept | Synonyms: beau ideal, idol, paragon |
| (noun) the state of being without a flaw or defect | Synonyms: flawlessness, ne plus ultra |
| perfectionism | (noun) a disposition to feel that anything less than perfect is unacceptable | - |
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| perfectionist | (noun) a person who is displeased by anything that does not meet very high standards | - |
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| perfective | (noun) the aspect of a verb that expresses a completed action | Synonyms: perfective aspect |
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| (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect, perfect tense, perfective tense |
| perfidiousness | (noun) betrayal of a trust | Synonyms: perfidy, treachery |
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| perfidy | (noun) an act of deliberate betrayal | Synonyms: betrayal, treachery, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, treachery |
| perfluorocarbon | (noun) a powerful greenhouse gas emitted during the production of aluminum | Synonyms: PFC |
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| perforation | (noun) the act of punching a hole (especially a row of holes as for ease of separation) | - |
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| (noun) a line of small holes for tearing at a particular place | - |
| (noun) a hole made in something | - |
| performance | (noun) the act of performing; of doing something successfully; using knowledge as distinguished from merely possessing it | Synonyms: carrying into action, carrying out, execution |
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| (noun) the act of presenting a play or a piece of music or other entertainment | - |
| (noun) any recognized accomplishment | - |
| (noun) a dramatic or musical entertainment | Synonyms: public presentation |
| (noun) process or manner of functioning or operating | Synonyms: functioning, operation |
| performer | (noun) an entertainer who performs a dramatic or musical work for an audience | Synonyms: performing artist |
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| performing | (noun) the performance of a part or role in a drama | Synonyms: acting, playacting, playing |
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| perfume | (noun) a toiletry that emits and diffuses a fragrant odor | Synonyms: essence |
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| (noun) a distinctive odor that is pleasant | Synonyms: aroma, fragrance, scent |
| perfumer | (noun) a person who makes (and sells) perfumes | - |
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| perfumery | (noun) the art of making perfumes | - |
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| (noun) an establishment where perfumes are made | - |
| (noun) store where perfumes are sold | - |
| (noun) perfumes in general | - |
| perfusion | (noun) pumping a liquid into an organ or tissue (especially by way of blood vessels) | - |
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| pergola | (noun) a framework that supports climbing plants | Synonyms: arbor, arbour, bower |
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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 |
| perjurer | (noun) a person who deliberately gives false testimony | Synonyms: false witness |
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| perjury | (noun) criminal offense of making false statements under oath | Synonyms: bearing false witness, lying under oath |
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| perk | (noun) an incidental benefit awarded for certain types of employment (especially if it is regarded as a right) | Synonyms: fringe benefit, perquisite |
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| perkiness | (noun) inappropriate playfulness | Synonyms: archness, impertinence, pertness, sauciness |
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| (noun) cheerfulness that bubbles to the surface | Synonyms: buoyancy |
| perleche | (noun) a disorder of the lips marked by scaling and fissures at the corners of the mouth; caused by a deficiency of riboflavin | Synonyms: cheilosis |
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| perm | (noun) a series of waves in the hair made by applying heat and chemicals | Synonyms: permanent, permanent wave |
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| permafrost | (noun) ground that is permanently frozen | - |
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| permanence | (noun) the property of being able to exist for an indefinite duration | Synonyms: permanency |
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| permanency | (noun) the property of being able to exist for an indefinite duration | Synonyms: permanence |
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| permanent | (noun) a series of waves in the hair made by applying heat and chemicals | Synonyms: perm, permanent wave |
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| permanganate | (noun) a dark purple salt of permanganic acid; in water solution it is used as a disinfectant and antiseptic | - |
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| permeability | (noun) the property of something that can be pervaded by a liquid (as by osmosis or diffusion) | Synonyms: permeableness |
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| permeableness | (noun) the property of something that can be pervaded by a liquid (as by osmosis or diffusion) | Synonyms: permeability |
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| permeation | (noun) mutual penetration; diffusion of each through the other | Synonyms: interpenetration |
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| (noun) the process of permeating or infusing something with a substance | Synonyms: pervasion, suffusion |
| permissibility | (noun) admissibility as a consequence of being permitted | - |
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| permission | (noun) the act of giving a formal (usually written) authorization | Synonyms: license, permit |
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| (noun) approval to do something | - |
| permissiveness | (noun) a disposition to allow freedom of choice and behavior | Synonyms: tolerance |
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| permissivism | (noun) lenience toward or indulgence of a wide variety of social behavior. | - |
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| permit | (noun) the act of giving a formal (usually written) authorization | Synonyms: license, permission |
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| (noun) large game fish; found in waters of the West Indies | Synonyms: Trachinotus falcatus |
| (noun) a legal document giving official permission to do something | Synonyms: licence, license |