| myope | (noun) a person with myopia; a nearsighted person | - |
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| nephoscope | (noun) a measuring instrument that uses a grid for measuring the altitude, direction, and velocity of movement of clouds | - |
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| neutropenia | (noun) leukopenia in which the decrease is primarily in number of neutrophils (the chief phagocytic leukocyte) | - |
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| oesophagoscope | (noun) an optical instrument for examining the inside of the esophagus | Synonyms: esophagoscope |
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| open | (noun) information that has become public | Synonyms: surface |
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| (noun) a tournament in which both professionals and amateurs may play | - |
| (noun) a clear or unobstructed space or expanse of land or water | Synonyms: clear |
| (noun) where the air is unconfined | Synonyms: open air, out-of-doors, outdoors |
| openbill | (noun) stork with a grooved bill whose upper and lower parts touch only at the base and tip | - |
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| opener | (noun) a hand tool used for opening sealed containers (bottles or cans) | - |
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| (noun) the first event in a series | - |
| (noun) a person who unfastens or unwraps or opens | Synonyms: undoer, unfastener, untier |
| openhandedness | (noun) liberality in bestowing gifts; extremely liberal and generous of spirit | Synonyms: largess, largesse, magnanimity, munificence |
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| opening | (noun) a recognized sequence of moves at the beginning of a game of chess | Synonyms: chess opening |
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| (noun) the act of opening something | - |
| (noun) becoming open or being made open | - |
| (noun) the first of a series of actions | Synonyms: first step, initiative, opening move |
| (noun) a vacant or unobstructed space that is man-made | - |
| (noun) an entrance equipped with a hatch; especially a passageway between decks of a ship | Synonyms: hatchway, scuttle |
| (noun) an aperture or hole that opens into a bodily cavity | Synonyms: orifice, porta |
| (noun) a possible alternative | Synonyms: possibility, possible action |
| (noun) the initial part of the introduction | - |
| (noun) the first performance (as of a theatrical production) | Synonyms: curtain raising, opening night |
| (noun) a ceremony accompanying the start of some enterprise | - |
| (noun) an open or empty space in or between things | Synonyms: gap |
| (noun) opportunity especially for employment or promotion | - |
| openness | (noun) characterized by an attitude of ready accessibility (especially about one's actions or purposes); without concealment; not secretive | Synonyms: nakedness |
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| (noun) willingness or readiness to receive (especially impressions or ideas) | Synonyms: receptiveness, receptivity |
| (noun) without obstructions to passage or view | - |
| openwork | (noun) ornamental work (such as embroidery or latticework) having a pattern of openings | - |
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| opepe | (noun) large African forest tree yielding a strong hard yellow to golden brown lumber; sometimes placed in genus Sarcocephalus | Synonyms: Nauclea diderrichii, Sarcocephalus diderrichii |
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| opera | (noun) a building where musical dramas are performed | Synonyms: opera house |
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| (noun) a drama set to music; consists of singing with orchestral accompaniment and an orchestral overture and interludes | - |
| operagoer | (noun) a patron of the opera | - |
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| operand | (noun) a quantity upon which a mathematical operation is performed | - |
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| operation | (noun) a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body | Synonyms: surgery, surgical operation, surgical procedure, surgical process |
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| (noun) (mathematics) calculation by mathematical methods | Synonyms: mathematical operation, mathematical process |
| (noun) activity by a military or naval force (as a maneuver or campaign) | Synonyms: military operation |
| (noun) a planned activity involving many people performing various actions | - |
| (noun) a process or series of acts especially of a practical or mechanical nature involved in a particular form of work | Synonyms: procedure |
| (noun) a business especially one run on a large scale | - |
| (noun) the activity of operating something (a machine or business etc.) | - |
| (noun) (psychology) the performance of some composite cognitive activity; an operation that affects mental contents | Synonyms: cognitive operation, cognitive process, mental process, process |
| (noun) (computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction) | - |
| (noun) process or manner of functioning or operating | Synonyms: functioning, performance |
| (noun) the state of being in effect or being operative | - |
| operationalism | (noun) (philosophy) the doctrine that the meaning of a proposition consists of the operations involved in proving or applying it | - |
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| operations | (noun) financial transactions at a brokerage; having to do with the execution of trades and keeping customer records | Synonyms: trading operations |
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| operative | (noun) someone who can be employed as a detective to collect information and assist in criminal investigations | Synonyms: PI, private detective, private eye, private investigator, shamus, sherlock |
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| (noun) a person secretly employed in espionage for a government | Synonyms: intelligence agent, intelligence officer, secret agent |
| operator | (noun) an agent that operates some apparatus or machine | Synonyms: manipulator |
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| (noun) someone who owns or operates a business | - |
| (noun) a shrewd or unscrupulous person who knows how to circumvent difficulties | Synonyms: hustler, wheeler dealer |
| (noun) a speculator who trades aggressively on stock or commodity markets | - |
| (noun) (mathematics) a symbol or function representing a mathematical operation | - |
| operculum | (noun) a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted | - |
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| operetta | (noun) a short amusing opera | Synonyms: light opera |
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| operon | (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene | - |
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| operoseness | (noun) the quality of requiring extended effort | Synonyms: laboriousness, toilsomeness |
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| ophthalmoscope | (noun) medical instrument for examining the retina of the eye | - |
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| orchiopexy | (noun) operation to bring an undescended testicle into the scrotum | - |
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| orthopedics | (noun) the branch of medical science concerned with disorders or deformities of the spine and joints | Synonyms: orthopaedics |
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| orthopedist | (noun) a specialist in correcting deformities of the skeletal system (especially in children) | Synonyms: orthopaedist |
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| orthoscope | (noun) an ophthalmoscope with a layer of water to neutralize the refraction of the cornea | - |
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| oscilloscope | (noun) electronic equipment that provides visual images of varying electrical quantities | Synonyms: cathode-ray oscilloscope, CRO, scope |
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| osteopetrosis | (noun) an inherited disorder characterized by an increase in bone density; in severe forms the bone marrow cavity may be obliterated | Synonyms: Albers-Schonberg disease, marble bones disease |
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| otoscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, auroscope |
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| pancytopenia | (noun) an abnormal deficiency in all blood cells (red blood cells and white blood cells and platelets); usually associated with bone marrow tumor or with aplastic anemia | - |
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| paratrooper | (noun) a soldier in the paratroops | Synonyms: para |
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| periscope | (noun) an optical instrument that provides a view of an otherwise obstructed field | - |
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| phalarope | (noun) small sandpiper-like shorebird having lobate toes and being good swimmers; breed in the Arctic and winter in the tropics | - |
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| pharmacopeia | (noun) (pharmacology) a book containing a compilation of pharmaceutical products with their formulas and methods of preparation | Synonyms: formulary |
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| polariscope | (noun) an optical device used to measure the rotation of the plane of vibration of polarized light | Synonyms: polarimeter |
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| polypropene | (noun) a polymer of propylene used as a thermoplastic molding material | Synonyms: polypropylene |
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| polypropenonitrile | (noun) acrylic resin used to make a strong soft crease-resistant fabric (trade name Acrilan) | Synonyms: Acrilan |
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| pope | (noun) the head of the Roman Catholic Church | Synonyms: Bishop of Rome, Catholic Pope, Holy Father, pontiff, Roman Catholic Pope, Vicar of Christ |
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| popery | (noun) offensive terms for the practices and rituals of the Roman Catholic Church | Synonyms: papism |
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| presbyope | (noun) a person with presbyopia; someone who is farsighted resulting from the progressive loss with aging of the elasticity of the crystalline lens | - |
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| proctoscope | (noun) an endoscope for examining the rectum | - |
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| propellant | (noun) any substance that propels | Synonyms: propellent |
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| propellent | (noun) any substance that propels | Synonyms: propellant |
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| propeller | (noun) a mechanical device that rotates to push against air or water | Synonyms: propellor |
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| propellor | (noun) a mechanical device that rotates to push against air or water | Synonyms: propeller |
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| propenal | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: acrolein |
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| propene | (noun) a flammable gas obtained by cracking petroleum; used in organic synthesis | Synonyms: propylene |
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| propenoate | (noun) a salt or ester of propenoic acid | Synonyms: acrylate |
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| propenonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: acrylonitrile, vinyl cyanide |
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| propensity | (noun) a disposition to behave in a certain way | Synonyms: aptness |
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| (noun) a natural inclination | Synonyms: leaning, proclivity |
| (noun) an inclination to do something | Synonyms: leaning, tendency |
| properness | (noun) correct or appropriate behavior | Synonyms: correctitude, propriety |
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| property | (noun) any movable articles or objects used on the set of a play or movie | Synonyms: prop |
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| (noun) a basic or essential property shared by all members of a class | - |
| (noun) a construct whereby objects or individuals can be distinguished | Synonyms: attribute, dimension |
| (noun) any area set aside for a particular purpose | Synonyms: place |
| (noun) something owned; any tangible or intangible possession that is owned by someone | Synonyms: belongings, holding |
| pyrope | (noun) a deep red garnet used as a gemstone | - |
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| pyroscope | (noun) a pyrometer that uses the color of the light emitted by a hot object | Synonyms: optical pyrometer |
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| radioisotope | (noun) a radioactive isotope of an element; produced either naturally or artificially | - |
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| rhinoscope | (noun) medical instrument consisting of a mirror mounted at an angle on a rod; used to examine the nasal passages (through the nasopharynx) | - |
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| roentgenoscope | (noun) an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation | Synonyms: fluoroscope |
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| rope | (noun) a strong line | - |
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| (noun) street names for flunitrazepam | Synonyms: circle, forget me drug, Mexican valium, R-2, roach, roofy, rophy |
| ropebark | (noun) deciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowers | Synonyms: Dirca palustris, leatherwood, moose-wood, moosewood, wicopy |
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| ropedancer | (noun) an acrobat who performs on a rope stretched at some height above the ground | Synonyms: ropewalker |
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| ropemaker | (noun) a craftsman who makes ropes | Synonyms: rope-maker, roper |
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| roper | (noun) a craftsman who makes ropes | Synonyms: rope-maker, ropemaker |
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| (noun) a cowboy who uses a lasso to rope cattle or horses | - |
| (noun) a decoy who lures customers into a gambling establishment (especially one with a fixed game) | - |
| ropewalk | (noun) workplace consisting of a long narrow path or shed where rope is made | Synonyms: rope yard |
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| ropewalker | (noun) an acrobat who performs on a rope stretched at some height above the ground | Synonyms: ropedancer |
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| ropeway | (noun) a conveyance that transports passengers or freight in carriers suspended from cables and supported by a series of towers | Synonyms: aerial tramway, cable tramway, tram, tramway |
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| salopettes | (noun) trousers usually of stretch material and kept taut by a strap under the foot, worn for skiing or as a fashion garment. | Synonyms: ski pants |
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| sapropel | (noun) sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans | - |
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| schizopetalon | (noun) a dainty South American annual having deeply pinnatifid leaves and racemes of fringed almond-scented purple-white flowers | Synonyms: Schizopetalon walkeri |
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| scolopendrium | (noun) a fern thought to resemble a millipede | - |
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| scope | (noun) electronic equipment that provides visual images of varying electrical quantities | Synonyms: cathode-ray oscilloscope, CRO, oscilloscope |
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| (noun) a magnifier of images of distant objects | Synonyms: telescope |
| (noun) an area in which something acts or operates or has power or control: | Synonyms: ambit, compass, orbit, range, reach |
| (noun) the state of the environment in which a situation exists | Synonyms: background, setting |
| sideropenia | (noun) a deficiency of iron; results from inadequate iron in the diet or from hemorrhage | - |
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| sigmoidoscope | (noun) an endoscope (a flexible fiberoptic probe) for examining the sigmoid colon | Synonyms: flexible sigmoidoscope |
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| sinoper | (noun) a red ocher formerly used as a pigment | Synonyms: sinopia, sinopis |
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| slope | (noun) the property possessed by a line or surface that departs from the horizontal | Synonyms: gradient |
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| (noun) an elevated geological formation | Synonyms: incline, side |
| snooper | (noun) a spy who makes uninvited inquiries into the private affairs of others | Synonyms: snoop |
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| spectroscope | (noun) an optical instrument for spectrographic analysis | Synonyms: prism spectroscope |
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| stanhope | (noun) a light open horse-drawn carriage with two or four wheels and one seat | - |
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| stanhopea | (noun) any of various orchids of the genus Stanhopea having a single large leaf and loose racemes of large fragrant flowers of various colors; Mexico to Brazil | - |
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| statoscope | (noun) An instrument that indicates small changes in an aircraft's altitude by recording small variations in atmospheric pressure. | - |
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| stereoscope | (noun) an optical device for viewing stereoscopic photographs | - |
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| stethoscope | (noun) a medical instrument for listening to the sounds generated inside the body | - |
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| stooper | (noun) a person who carries himself or herself with the head and shoulders habitually bent forward | - |
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| (noun) a person at a racetrack who searches for winning parimutuel tickets that have been carelessly discarded by others | - |
| stroboscope | (noun) scientific instrument that provides a flashing light synchronized with the periodic movement of an object; can make moving object appear stationary | Synonyms: strobe, strobe light |
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| synchronoscope | (noun) an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines) | Synonyms: synchroniser, synchronizer, synchroscope |
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| synchroscope | (noun) an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines) | Synonyms: synchroniser, synchronizer, synchronoscope |
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| syncope | (noun) (phonology) the loss of sounds from within a word (as in `fo'c'sle' for `forecastle') | Synonyms: syncopation |
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| (noun) a spontaneous loss of consciousness caused by insufficient blood to the brain | Synonyms: deliquium, faint, swoon |
| tachistoscope | (noun) scientific instrument used by psychologists; presents visual stimuli for brief exposures | Synonyms: t-scope |
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| telescope | (noun) a magnifier of images of distant objects | Synonyms: scope |
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| thiopental | (noun) barbiturate that is a hygroscopic powder (trade name Pentothal) that is a strong barbiturate that acts rapidly; induces a relaxed state when injected as a general anesthetic | Synonyms: Pentothal, thiopental sodium, thiopentobarbital sodium |
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| thrombocytopenia | (noun) a blood disease characterized by an abnormally small number of platelets in the blood | Synonyms: thrombopenia |
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| thrombopenia | (noun) a blood disease characterized by an abnormally small number of platelets in the blood | Synonyms: thrombocytopenia |
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| tightrope | (noun) tightly stretched rope or wire on which acrobats perform high above the ground | - |
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| tope | (noun) a dome-shaped shrine erected by Buddhists | Synonyms: stupa |
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| topee | (noun) a lightweight hat worn in tropical countries for protection from the sun | Synonyms: pith hat, pith helmet, sun helmet, topi |
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| toper | (noun) a person who drinks alcoholic beverages (especially to excess) | Synonyms: drinker, imbiber, juicer |
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| towrope | (noun) (nautical) a rope used in towing | Synonyms: towing line, towing rope, towline |
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| trooper | (noun) a mounted police officer | - |
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| (noun) a soldier in a motorized army unit | Synonyms: cavalryman |
| (noun) a state police officer | Synonyms: state trooper |
| (noun) a soldier mounted on horseback | Synonyms: cavalryman |