| 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 |