| orthopnea | (noun) form of dyspnea in which the person can breathe comfortably only when standing or sitting erect; associated with asthma and emphysema and angina pectoris | - |
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| orthopter | (noun) heavier-than-air craft that is propelled by the flapping of wings | Synonyms: ornithopter |
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| orthopteran | (noun) any of various insects having leathery forewings and membranous hind wings and chewing mouthparts | Synonyms: orthopteron, orthopterous insect |
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| orthopteron | (noun) any of various insects having leathery forewings and membranous hind wings and chewing mouthparts | Synonyms: orthopteran, orthopterous insect |
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| orthoptics | (noun) treatment of defects of binocular vision (such as strabismus and amblyopia) by nonsurgical measures (especially by exercises to strengthen the eye muscles) | - |
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| orthoptist | (noun) a specialist in orthoptics | - |
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| orthoscope | (noun) an ophthalmoscope with a layer of water to neutralize the refraction of the cornea | - |
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| ortolan | (noun) brownish Old World bunting often eaten as a delicacy | Synonyms: Emberiza hortulana, ortolan bunting |
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| ortygan | (noun) any of several East Indian birds | - |
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| outport | (noun) a subsidiary port built in deeper water than the original port (but usually farther from the center of trade) | - |
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| paleocortex | (noun) the olfactory cortex of the cerebrum | Synonyms: archipallium |
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| passport | (noun) any quality or characteristic that gains a person a favorable reception or acceptance or admission | Synonyms: recommendation |
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| (noun) a document issued by a country to a citizen allowing that person to travel abroad and re-enter the home country | - |
| (noun) any authorization to pass or go somewhere | Synonyms: pass |
| pearlwort | (noun) any of various low-growing plants of the genus Sagina having small spherical flowers resembling pearls | Synonyms: pearl-weed, pearlweed |
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| pennyworth | (noun) the amount that can be bought for a penny | Synonyms: penn'orth |
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| pepperwort | (noun) annual herb used as salad green and garnish | Synonyms: common garden cress, garden pepper cress, Lepidium sativum, pepper grass |
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| (noun) any of several water ferns of the genus Marsilea having four leaflets | Synonyms: clover fern |
| pianoforte | (noun) a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds | Synonyms: forte-piano, piano |
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| pilewort | (noun) perennial herb native to Europe but naturalized elsewhere having heart-shaped leaves and yellow flowers resembling buttercups; its tuberous roots have been used as a poultice to relieve piles | Synonyms: lesser celandine, Ranunculus ficaria |
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| pillwort | (noun) European water fern found around margins of bodies of water or in wet acid soil having small globose sporocarps | Synonyms: Pilularia globulifera |
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| pipewort | (noun) aquatic perennial of North America and Ireland and Hebrides having translucent green leaves in a basal spiral and dense buttonlike racemes of minute white flowers | Synonyms: Eriocaulon aquaticum |
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| port | (noun) an opening (in a wall or ship or armored vehicle) for firing through | Synonyms: embrasure, porthole |
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| (noun) (computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals) | Synonyms: interface |
| (noun) the left side of a ship or aircraft to someone who is aboard and facing the bow or nose | Synonyms: larboard |
| (noun) sweet dark-red dessert wine originally from Portugal | Synonyms: port wine |
| (noun) a place (seaport or airport) where people and merchandise can enter or leave a country | - |
| porta | (noun) an aperture or hole that opens into a bodily cavity | Synonyms: opening, orifice |
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| portability | (noun) the quality of being light enough to be carried | - |
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| portable | (noun) a small light typewriter; usually with a case in which it can be carried | - |
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| portage | (noun) carrying boats and supplies overland | - |
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| (noun) overland track between navigable waterways | - |
| (noun) the cost of carrying or transporting | - |
| portal | (noun) a grand and imposing entrance (often extended metaphorically) | - |
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| (noun) a short vein that carries blood into the liver | Synonyms: hepatic portal vein, portal vein, vena portae |
| (noun) a site that the owner positions as an entrance to other sites on the internet | Synonyms: portal site |
| portcullis | (noun) gate consisting of an iron or wooden grating that hangs in the entry to a castle or fortified town; can be lowered to prevent passage | - |
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| portent | (noun) a sign of something about to happen | Synonyms: omen, presage, prodigy, prognostic, prognostication |
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| porter | (noun) a very dark sweet ale brewed from roasted unmalted barley | Synonyms: porter's beer |
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| (noun) a person employed to carry luggage and supplies | - |
| (noun) a railroad employee who assists passengers (especially on sleeping cars) | Synonyms: Pullman porter |
| (noun) someone who guards an entrance | Synonyms: door guard, doorkeeper, doorman, gatekeeper, hall porter, ostiary |
| porterage | (noun) the transportation of burdens by porters | - |
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| (noun) the charge for carrying burdens by porters | - |
| porterhouse | (noun) large steak from the thick end of the short loin containing a T-shaped bone and large piece of tenderloin | Synonyms: porterhouse steak |
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| portfolio | (noun) the role of the head of a government department | - |
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| (noun) a large, flat, thin case for carrying loose papers or drawings or maps; usually leather | - |
| (noun) a list of the financial assets held by an individual or a bank or other financial institution | - |
| (noun) a set of pieces of creative work collected to be shown to potential customers or employers | - |
| porthole | (noun) a window in a ship or airplane | - |
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| (noun) an opening (in a wall or ship or armored vehicle) for firing through | Synonyms: embrasure, port |
| portico | (noun) a porch or entrance to a building consisting of a covered and often columned area | - |
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| portiere | (noun) a heavy curtain hung across a doorway | - |
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| portion | (noun) the allotment of some amount by dividing something | Synonyms: parcel, share |
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| (noun) something less than the whole of a human artifact | Synonyms: part |
| (noun) an individual quantity of food or drink taken as part of a meal | Synonyms: helping, serving |
| (noun) assets belonging to or due to or contributed by an individual person or group | Synonyms: part, percentage, share |
| (noun) money or property brought by a woman to her husband at marriage | Synonyms: dower, dowery, dowry |
| (noun) something determined in relation to something that includes it | Synonyms: component, component part, constituent, part |
| (noun) your overall circumstances or condition in life (including everything that happens to you) | Synonyms: circumstances, destiny, fate, fortune, lot, luck |
| portmanteau | (noun) a large travelling bag made of stiff leather | Synonyms: Gladstone, Gladstone bag |
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| (noun) a new word formed by joining two others and combining their meanings | Synonyms: blend, portmanteau word |
| portrait | (noun) any likeness of a person, in any medium | Synonyms: portrayal |
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| (noun) a word picture of a person's appearance and character | Synonyms: portraiture, portrayal |
| portraitist | (noun) a painter or drawer of portraits | Synonyms: limner, portrait painter, portrayer |
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| portraiture | (noun) the activity of making portraits | - |
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| (noun) a word picture of a person's appearance and character | Synonyms: portrait, portrayal |
| portrayal | (noun) representation by drawing or painting etc | Synonyms: delineation, depiction |
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| (noun) acting the part of a character on stage; dramatically representing the character by speech and action and gesture | Synonyms: characterization, enactment, personation |
| (noun) any likeness of a person, in any medium | Synonyms: portrait |
| (noun) a representation by picture or portraiture | Synonyms: depicting, depiction, portraying |
| (noun) a word picture of a person's appearance and character | Synonyms: portrait, portraiture |
| portrayer | (noun) a painter or drawer of portraits | Synonyms: limner, portrait painter, portraitist |
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| portraying | (noun) a representation by picture or portraiture | Synonyms: depicting, depiction, portrayal |
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| portulaca | (noun) a plant of the genus Portulaca having pink or red or purple or white ephemeral flowers | - |
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| portwatcher | (noun) a watchman on a wharf | Synonyms: port watcher |
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| postmortem | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: autopsy, necropsy, PM, post-mortem, post-mortem examination, postmortem examination |
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| (noun) discussion of an event after it has occurred | Synonyms: post-mortem |
| praiseworthiness | (noun) the quality of being worthy of praise | Synonyms: laudability, laudableness |
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| praisworthiness | (noun) the property of deserving praise | - |
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| proportion | (noun) magnitude or extent | Synonyms: dimension |
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| (noun) harmonious arrangement or relation of parts or elements within a whole (as in a design) | Synonyms: balance, proportionality |
| (noun) the quotient obtained when the magnitude of a part is divided by the magnitude of the whole | - |
| (noun) the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree | Synonyms: ratio |
| (noun) balance among the parts of something | Synonyms: symmetry |
| proportional | (noun) one of the quantities in a mathematical proportion | - |
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| proportionality | (noun) harmonious arrangement or relation of parts or elements within a whole (as in a design) | Synonyms: balance, proportion |
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| (noun) a ratio of two quantities that is constant | - |
| proportionateness | (noun) the relation of corresponding in degree or size or amount | Synonyms: commensurateness, correspondence |
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| purport | (noun) the pervading meaning or tenor | Synonyms: drift |
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| (noun) the intended meaning of a communication | Synonyms: intent, spirit |
| quillwort | (noun) any of several spore-bearing aquatic or marsh plants having short rhizomes and leaves resembling quills; worldwide except Polynesia | - |
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| ragsorter | (noun) a worker who sorts rags and old clothing for new uses (as in papermaking) | - |
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| ragwort | (noun) widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity | Synonyms: benweed, ragweed, Senecio jacobaea, tansy ragwort |
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| (noun) American ragwort with yellow flowers | Synonyms: butterweed, Senecio glabellus |
| rapport | (noun) a relationship of mutual understanding or trust and agreement between people | Synonyms: resonance |
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| rapporteur | (noun) a recorder appointed by a committee to prepare reports of the meetings | - |
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| reapportionment | (noun) a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census results) | Synonyms: reallocation, reallotment |
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| report | (noun) the general estimation that the public has for a person | Synonyms: reputation |
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| (noun) a short account of the news | Synonyms: account, news report, story, write up |
| (noun) the act of informing by verbal report | Synonyms: account |
| (noun) an essay (especially one written as an assignment) | Synonyms: composition, paper, theme |
| (noun) a written document describing the findings of some individual or group | Synonyms: study, written report |
| (noun) a written evaluation of a student's scholarship and deportment | Synonyms: report card |
| (noun) a sharp explosive sound (especially the sound of a gun firing) | - |
| reportage | (noun) the news as presented by reporters for newspapers or radio or television | Synonyms: coverage, reporting |
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| reporter | (noun) a person who investigates and reports or edits news stories | Synonyms: newsperson |
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| reporting | (noun) the news as presented by reporters for newspapers or radio or television | Synonyms: coverage, reportage |
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| resort | (noun) act of turning to for assistance | Synonyms: recourse, refuge |
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| (noun) something or someone turned to for assistance or security | Synonyms: recourse, refuge |
| (noun) a hotel located in a resort area | Synonyms: holiday resort, resort hotel |
| (noun) a frequently visited place | Synonyms: hangout, haunt, repair, stamping ground |
| retort | (noun) a vessel where substances are distilled or decomposed by heat | - |
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| (noun) a quick reply to a question or remark (especially a witty or critical one) | Synonyms: comeback, counter, rejoinder, replication, return, riposte |
| ribwort | (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: buckthorn, English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ripple-grass |
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| roadworthiness | (noun) (of motor vehicles) the quality of being fit to drive on the open road | - |
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| rupturewort | (noun) common prostrate Old World herb often used as a ground cover; formerly reputed to cure ruptures | Synonyms: Hernaria glabra |
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| saltwort | (noun) low-growing strong-smelling coastal shrub of warm parts of the New World having unisexual flowers in conelike spikes and thick succulent leaves | Synonyms: Batis maritima |
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| (noun) bushy plant of Old World salt marshes and sea beaches having prickly leaves; burned to produce a crude soda ash | Synonyms: barilla, glasswort, kali, kelpwort, Salsola kali, Salsola soda |
| sandwort | (noun) low-growing chiefly perennial plant usually with small white flowers suitable for e.g. rock gardens | - |
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| (noun) low-growing herb having clusters of small white four-petaled flowers | Synonyms: Moehringia lateriflora |
| (noun) loosely matted plant with moss-like foliage studded with tiny starry four-petaled white blossoms; mountains of central and southern Europe | Synonyms: Moehringia mucosa |
| sawwort | (noun) European perennial whose serrate leaves yield a yellow dye | Synonyms: Serratula tinctoria |
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| scissortail | (noun) grey flycatcher of the southwestern United States and Mexico and Central America having a long forked tail and white breast and salmon and scarlet markings | Synonyms: Muscivora-forficata, scissortailed flycatcher |
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| seaport | (noun) a sheltered port where ships can take on or discharge cargo | Synonyms: harbor, harbour, haven |
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| seaworthiness | (noun) fitness to traverse the seas | - |
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| setterwort | (noun) digitate-leaved hellebore with an offensive odor and irritant qualities when taken internally | Synonyms: bear's foot, Helleborus foetidus, stinking hellebore |
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| short | (noun) the fielding position of the player on a baseball team who is stationed between second and third base | Synonyms: shortstop |
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| (noun) the location on a baseball field where the shortstop is stationed | - |
| (noun) accidental contact between two points in an electric circuit that have a potential difference | Synonyms: short circuit |
| shortage | (noun) the property of being an amount by which something is less than expected or required | Synonyms: deficit, shortfall |
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| (noun) an acute insufficiency | Synonyms: dearth, famine |
| shortbread | (noun) very rich thick butter cookie | Synonyms: shortbread cookie |
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| shortcake | (noun) very short biscuit dough baked as individual biscuits or a round loaf; served with sweetened fruit and usually whipped cream | - |
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| shortcoming | (noun) a failing or deficiency | Synonyms: defect |
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| shortcut | (noun) a route shorter than the usual one | Synonyms: crosscut, cutoff |
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| shortener | (noun) any agent that shortens | - |
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| shortening | (noun) act of decreasing in length | - |
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| (noun) fat such as butter or lard used in baked goods | - |
| shortfall | (noun) the property of being an amount by which something is less than expected or required | Synonyms: deficit, shortage |
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| shortgrass | (noun) any of various grasses that are short and can tolerate drought conditions; common on the dry upland plains just east of the Rocky Mountains | Synonyms: short-grass |
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| shorthand | (noun) a method of writing rapidly using an abbreviated symbolic system | Synonyms: stenography, tachygraphy |
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| shorthorn | (noun) English breed of short-horned cattle | Synonyms: Durham |
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| shortia | (noun) any plant of the genus Shortia; evergreen perennial herbs with smooth leathery basal leaves and showy white solitary flowers | - |
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| shortlist | (noun) a list of applicants winnowed from a longer list who have been deemed suitable and from which the successful person will be chosen | Synonyms: short list |
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| shortness | (noun) an abrupt discourteous manner | Synonyms: abruptness, brusqueness, curtness, gruffness |
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| (noun) the property of being shorter than average stature | - |
| (noun) the property of being of short temporal extent | - |
| (noun) the property of being of short spatial extent | - |
| (noun) the property of being truncated or short | Synonyms: truncation |
| (noun) the condition of being short of something | - |
| shorts | (noun) (used in the plural) trousers that end at or above the knee | Synonyms: short pants, trunks |
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| (noun) underpants worn by men | Synonyms: boxers, boxershorts, drawers, underdrawers |
| shortsightedness | (noun) a lack of prudence and care by someone in the management of resources | Synonyms: improvidence |
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| (noun) (ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred | Synonyms: myopia, nearsightedness |
| shortstop | (noun) the fielding position of the player on a baseball team who is stationed between second and third base | Synonyms: short |
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| (noun) (baseball) the person who plays the shortstop position | - |
| slipperwort | (noun) any garden plant of the genus Calceolaria having flowers with large inflated slipper-shaped lower lip | Synonyms: calceolaria |
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| sneezewort | (noun) Eurasian herb having loose heads of button-shaped white flowers and long grey-green leaves that cause sneezing when powdered | Synonyms: Achillea ptarmica, sneezeweed yarrow |
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| snort | (noun) a cry or noise made to express displeasure or contempt | Synonyms: bird, boo, Bronx cheer, hiss, hoot, raspberry, razz, razzing |
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| (noun) a disrespectful laugh | Synonyms: snicker, snigger |
| snorter | (noun) something that is extraordinary or remarkable or prominent | - |
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| (noun) something outstandingly difficult | - |
| (noun) someone who expresses contempt or indignation by uttering a snorting sound | - |
| snorting | (noun) an act of forcible exhalation | Synonyms: huffing, puffing |
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| soapwort | (noun) plant of European origin having pink or white flowers and leaves yielding a detergent when bruised | Synonyms: bouncing Bess, bouncing Bet, hedge pink, Saponaria officinalis |
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| sort | (noun) an approximate definition or example | - |
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| (noun) a category of things distinguished by some common characteristic or quality | Synonyms: form, kind, variety |
| (noun) a person of a particular character or nature | - |
| (noun) an operation that segregates items into groups according to a specified criterion | Synonyms: sorting |
| sorter | (noun) a machine for sorting things (such as punched cards or letters) into classes | - |
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| (noun) a clerk who sorts things (as letters at the post office) | - |