| 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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| periphrastic | (adjective) roundabout and unnecessarily wordy | Synonyms: ambagious, circumlocutious, circumlocutory |
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| peripteral | (adjective) having columns on all sides | - |
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| perirhinal | (adjective) near the nose | Synonyms: perinasal |
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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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| perish | (verb) pass from physical life and lose all bodily attributes and functions necessary to sustain life | Synonyms: buy the farm, cash in one's chips, choke, conk, croak, decease, die, drop dead, exit, expire, give-up the ghost, go, kick the bucket, pass, pass away, pop off, snuff it |
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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 | (adjective) liable to perish; subject to destruction or death or decay | - |
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| (noun) food that will decay rapidly if not refrigerated | Synonyms: spoilable |
| 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 | - |
| peristylar | (adjective) having columniation completely circling an area of the structure | Synonyms: pseudoperipteral |
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| peristyle | (noun) a colonnade surrounding a building or enclosing a court | - |
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| perithecium | (noun) flask-shaped ascocarp | - |
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| perithelial | (adjective) of or relating to the tissue layer around small blood vessels | - |
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| perithelium | (noun) tissue layer around small blood vessels | - |
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| peritoneal | (adjective) of or relating to or affecting the peritoneum | - |
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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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| peritrichous | (adjective) covered all over with uniformly distributed flagella | - |
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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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| periwigged | (adjective) wearing a wig popular for men in the 17th and 18th centuries | Synonyms: peruked |
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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 |
| perjure | (verb) knowingly tell an untruth in a legal court and render oneself guilty of perjury | - |
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| 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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| (verb) gain or regain energy | Synonyms: gain vigor, percolate, perk up, pick up |
| perkily | (adverb) in a perky manner | - |
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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 |
| perky | (adjective) characterized by liveliness and lightheartedness | Synonyms: buoyant, chirpy |
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| 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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| (verb) give a permanent wave to | - |
| 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 | (adjective) continuing or enduring without marked change in status or condition or place | Synonyms: lasting |
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| (adjective) not capable of being reversed or returned to the original condition | - |
| (noun) a series of waves in the hair made by applying heat and chemicals | Synonyms: perm, permanent wave |
| permanently | (adverb) for a long time without essential change | Synonyms: for good |
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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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| permeable | (adjective) allowing fluids or gases to pass or diffuse through | - |
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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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| permeant | (adjective) spreading or spread throughout | Synonyms: permeating, permeative, pervasive |
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| permeate | (verb) pass through | Synonyms: filter, percolate, sink in |
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| (verb) spread or diffuse through | Synonyms: diffuse, imbue, interpenetrate, penetrate, pervade, riddle |
| (verb) penetrate mutually or be interlocked | Synonyms: interpenetrate |
| permeating | (adjective) spreading or spread throughout | Synonyms: permeant, permeative, pervasive |
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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 |
| permeative | (adjective) spreading or spread throughout | Synonyms: permeant, permeating, pervasive |
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| permed | (adjective) (of hair) styled with permanent waves | - |
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| permissibility | (noun) admissibility as a consequence of being permitted | - |
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| permissible | (adjective) that may be permitted especially as according to rule | Synonyms: allowable |
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| (adjective) that may be accepted or conceded | - |
| permissibly | (adverb) in a permissible manner | Synonyms: allowably |
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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 | - |
| permissive | (adjective) granting or inclined or able to grant permission; not strict in discipline | - |
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| (adjective) not preventive | - |
| permissively | (adverb) in a permissive manner | - |
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| 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 |
| (verb) consent to, give permission; permit | Synonyms: allow, countenance, let |
| (verb) allow the presence of or allow (an activity) without opposing or prohibiting | Synonyms: allow, tolerate |
| (verb) make it possible through a specific action or lack of action for something to happen | Synonyms: allow, let |
| permutability | (noun) ability to change sequence | Synonyms: permutableness, transposability |
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| permutable | (adjective) capable of changing sequence | Synonyms: transposable |
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| permutableness | (noun) ability to change sequence | Synonyms: permutability, transposability |
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| permutation | (noun) complete change in character or condition | - |
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| (noun) the act of changing the arrangement of a given number of elements | - |
| (noun) act of changing the lineal order of objects in a group | - |
| (noun) an event in which one thing is substituted for another | Synonyms: replacement, substitution, switch, transposition |
| permute | (verb) change the order or arrangement of | Synonyms: commute, transpose |
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| pernicious | (adjective) working or spreading in a hidden and usually injurious way | Synonyms: insidious, subtle |
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| (adjective) exceedingly harmful | Synonyms: baneful, deadly, pestilent |
| perniciously | (adverb) in a noxiously baneful way | Synonyms: banefully |
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| (adverb) in a harmfully insidious manner | Synonyms: insidiously |
| perniciousness | (noun) grave harmfulness or deadliness | Synonyms: toxicity |
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| pernickety | (adjective) characterized by excessive precision and attention to trivial details | Synonyms: persnickety |
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| pernio | (noun) inflammation of the hands and feet caused by exposure to cold and moisture | Synonyms: chilblain, chilblains |
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| peroneal | (adjective) of or relating to the fibula or the outer part of the leg below the knee | - |
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| peroneus | (noun) muscle of the lower leg that is involved in moving the foot | - |
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| perorate | (verb) deliver an oration in grandiloquent style | - |
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| (verb) conclude a speech with a formal recapitulation | - |
| peroration | (noun) (rhetoric) the concluding section of an oration | - |
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| (noun) a flowery and highly rhetorical oration | - |
| peroxidase | (noun) any of a group of enzymes (occurring especially in plant cells) that catalyze the oxidation of a compound by a peroxide | - |
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| peroxide | (noun) a viscous liquid with strong oxidizing properties; a powerful bleaching agent; also used (in aqueous solutions) as a mild disinfectant and (in strong concentrations) as an oxidant in rocket fuels | Synonyms: hydrogen peroxide |
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| (noun) an inorganic compound containing the divalent ion -O-O- | - |
| (verb) bleach with peroxide | - |
| perpendicular | (adjective) intersecting at or forming right angles | - |
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| (adjective) at right angles to the plane of the horizon or a base line | Synonyms: vertical |
| (adjective) so steep as to be nearly vertical | - |
| (noun) an extremely steep face | - |
| (noun) a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point | Synonyms: plumb line |
| (noun) a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting | Synonyms: English-Gothic, English-Gothic architecture, perpendicular style |
| (noun) a straight line at right angles to another line | - |
| perpendicularity | (noun) the quality of being at right angles to a given line or plane (especially the plane of the horizon) | - |
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| (noun) the relation of opposition between things at right angles | Synonyms: orthogonal opposition, orthogonality |
| perpendicularly | (adverb) in a perpendicular manner | - |
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| (adverb) straight up or down without a break | Synonyms: sheer |
| perpetrate | (verb) perform an act, usually with a negative connotation | Synonyms: commit, pull |
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| perpetration | (noun) the act of committing a crime | Synonyms: commission, committal |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| perpetual | (adjective) uninterrupted in time and indefinitely long continuing | Synonyms: ceaseless, constant, incessant, never-ending, unceasing, unremitting |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eonian, eternal, everlasting, unceasing, unending |
| perpetually | (adverb) invariably | Synonyms: always, constantly, forever, incessantly |
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| (adverb) everlastingly; for all time | - |
| perpetuate | (verb) cause to continue or prevail | - |
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| perpetuation | (noun) the act of prolonging something | Synonyms: lengthening, prolongation, protraction |
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| perpetuity | (noun) the property of being perpetual (seemingly ceaseless) | Synonyms: sempiternity |
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| perphenazine | (noun) tranquilizer and antidepressant (trade name Triavil) sometimes used as an antiemetic for adults | Synonyms: Triavil |
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| perplex | (verb) make more complicated | Synonyms: complicate |
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| (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, dumbfound, flummox, get, gravel, mystify, nonplus, pose, puzzle, stick, stupefy, vex |
| perplexed | (adjective) full of difficulty or confusion or bewilderment | - |
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| perplexedly | (adverb) in a perplexed manner | Synonyms: confoundedly |
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| perplexing | (adjective) lacking clarity of meaning; causing confusion or perplexity | Synonyms: confusing, puzzling |
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| perplexity | (noun) trouble or confusion resulting from complexity | - |
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| perquisite | (noun) a right reserved exclusively by a particular person or group (especially a hereditary or official right) | Synonyms: exclusive right, prerogative, privilege |
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| (noun) an incidental benefit awarded for certain types of employment (especially if it is regarded as a right) | Synonyms: fringe benefit, perk |
| perry | (noun) a fermented and often effervescent beverage made from juice of pears; similar in taste to hard cider | - |
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| persecute | (verb) cause to suffer | Synonyms: oppress |
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| persecution | (noun) the act of persecuting (especially on the basis of race or religion) | - |
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| persecutor | (noun) someone who torments | Synonyms: tormenter, tormentor |
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| perseverance | (noun) the act of persisting or persevering; continuing or repeating behavior | Synonyms: perseveration, persistence |
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| (noun) persistent determination | Synonyms: doggedness, persistence, persistency, pertinacity, tenaciousness, tenacity |