| interoperable | (adjective) able to exchange and use information | - |
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| isotope | (noun) one of two or more atoms with the same atomic number but with different numbers of neutrons | - |
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| kaleidoscope | (noun) an optical toy in a tube; it produces symmetrical patterns as bits of colored glass are reflected by mirrors | - |
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| (noun) a complex pattern of constantly changing colors and shapes | - |
| keratoscope | (noun) medical instrument to examine the cornea in order to detect irregularities in its anterior surface | - |
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| kinescope | (noun) a cathode-ray tube in a television receiver; translates the received signal into a picture on a luminescent screen | Synonyms: picture tube, television tube |
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| kopeck | (noun) 100 kopecks equal 1 ruble in Russia | Synonyms: copeck, kopek |
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| kopek | (noun) 100 kopecks equal 1 ruble in Russia | Synonyms: copeck, kopeck |
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| laparoscope | (noun) a slender endoscope inserted through an incision in the abdominal wall in order to examine the abdominal organs or to perform minor surgery | - |
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| laryngoscope | (noun) a medical instrument for examining the larynx | - |
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| leucopenia | (noun) an abnormal lowering of the white blood cell count | Synonyms: leukopenia |
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| leukopenia | (noun) an abnormal lowering of the white blood cell count | Synonyms: leucopenia |
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| looper | (noun) small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae | Synonyms: inchworm, measuring worm |
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| lope | (noun) a smooth three-beat gait; between a trot and a gallop | Synonyms: canter |
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| (noun) a slow pace of running | Synonyms: jog, trot |
| (verb) run easily | - |
| lycanthrope | (noun) a monster able to change appearance from human to wolf and back again | Synonyms: loup-garou, werewolf, wolfman |
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| lycopene | (noun) carotenoid that makes tomatoes red; may lower the risk of prostate cancer | - |
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| lymphocytopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphopenia |
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| lymphopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphocytopenia |
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| malope | (noun) western Mediterranean annual having deep purple-red flowers subtended by 3 large cordate bracts | Synonyms: Malope trifida |
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| mastopexy | (noun) plastic surgery to lift or reshape the breasts | - |
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| micropenis | (noun) an abnormally small penis | Synonyms: microphallus |
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| microscope | (noun) magnifier of the image of small objects | - |
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| misanthrope | (noun) someone who dislikes people in general | Synonyms: misanthropist |
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| misopedia | (noun) hatred of children | - |
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| mope | (noun) someone who wastes time | Synonyms: dallier, dilly-dallier, dillydallier, lounger |
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| (verb) be apathetic, gloomy, or dazed | Synonyms: moon about, moon around |
| (verb) move around slowly and aimlessly | Synonyms: mope around |
| moped | (noun) a motorbike that can be pedaled or driven by a low-powered gasoline engine | - |
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| mopes | (noun) an informal expression for a mildly depressed state | Synonyms: dumps |
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| 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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| nonopening | (adjective) not open; not opening | - |
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| nonoperational | (adjective) (military) not involved in military operations | Synonyms: inactive |
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| oesophagoscope | (noun) an optical instrument for examining the inside of the esophagus | Synonyms: esophagoscope |
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| open | (adjective) ready or willing to receive favorably | Synonyms: receptive |
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| (adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: unfastened |
| (adjective) affording free passage or access | - |
| (adjective) (set theory) of an interval that contains neither of its endpoints | - |
| (adjective) open and observable; not secret or hidden | Synonyms: overt |
| (adjective) used of mouth or eyes | Synonyms: opened |
| (adjective) ready for business | - |
| (adjective) not having been filled | - |
| (adjective) (of textures) full of small openings or gaps | Synonyms: loose |
| (adjective) openly straightforward and direct without reserve or secretiveness | Synonyms: candid, heart-to-heart |
| (adjective) not requiring union membership | - |
| (adjective) open to or in view of all | - |
| (adjective) possibly accepting or permitting | Synonyms: capable, subject |
| (adjective) without undue constriction as from e.g. tenseness or inhibition | - |
| (adjective) having no protecting cover or enclosure | - |
| (adjective) affording free passage or view | Synonyms: clear |
| (adjective) with no protection or shield | Synonyms: exposed |
| (adjective) accessible to all | - |
| (adjective) not sealed or having been unsealed | Synonyms: opened |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: undecided, undetermined, unresolved |
| (adjective) not defended or capable of being defended | Synonyms: assailable, undefendable, undefended |
| (noun) information that has become public | Synonyms: surface |
| (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 |
| (verb) make available | Synonyms: open up |
| (verb) become available | Synonyms: open up |
| (verb) make the opening move | - |
| (verb) cause to open or to become open | Synonyms: open up |
| (verb) become open | Synonyms: open up |
| (verb) spread out or open from a closed or folded state | Synonyms: spread, spread out, unfold |
| (verb) display the contents of a file or start an application as on a computer | - |
| (verb) afford access to | Synonyms: afford, give |
| (verb) start to operate or function or cause to start operating or functioning | Synonyms: open up |
| (verb) begin or set in action, of meetings, speeches, recitals, etc. | - |
| (verb) have an opening or passage or outlet | - |
| openbill | (noun) stork with a grooved bill whose upper and lower parts touch only at the base and tip | - |
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| opencast | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencut |
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| opencut | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencast |
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| opened | (adjective) used of mouth or eyes | Synonyms: open |
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| (adjective) made open or clear | - |
| (adjective) not sealed or having been unsealed | Synonyms: open |
| 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 |
| openhanded | (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, liberal |
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| openhandedness | (noun) liberality in bestowing gifts; extremely liberal and generous of spirit | Synonyms: largess, largesse, magnanimity, munificence |
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| openhearted | (adjective) freely communicative; candidly straightforward | - |
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| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, sympathetic |
| opening | (adjective) first or beginning | - |
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| (noun) a recognized sequence of moves at the beginning of a game of chess | Synonyms: chess opening |
| (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 | - |
| openly | (adverb) in an open way | - |
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| openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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| 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 | - |
| operable | (adjective) capable of being treated by surgical operation | - |
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| (adjective) usable for a specific purpose | Synonyms: practicable |
| (adjective) fit or ready for use or service | Synonyms: functional, operational, usable, useable |
| 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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| operant | (adjective) having influence or producing an effect | - |
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| operate | (verb) perform surgery on | Synonyms: operate on |
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| (verb) perform a movement in military or naval tactics in order to secure an advantage in attack or defense | Synonyms: maneuver, manoeuver, manoeuvre |
| (verb) handle and cause to function | Synonyms: control |
| (verb) keep engaged | Synonyms: engage, lock, mesh |
| (verb) perform as expected when applied | Synonyms: function, go, run, work |
| (verb) direct or control; projects, businesses, etc. | Synonyms: run |
| operatic | (adjective) of or relating to or characteristic of opera | - |
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| operating | (adjective) involved in a kind of operation | - |
|---|
| (adjective) being in effect or operation | Synonyms: in operation, operational |
| 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 | - |
| operational | (adjective) (military) of or intended for or involved in military operations | - |
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| (adjective) pertaining to a process or series of actions for achieving a result | - |
| (adjective) being in effect or operation | Synonyms: in operation, operating |
| (adjective) fit or ready for use or service | Synonyms: functional, operable, usable, useable |
| 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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| operationalist | (adjective) of or relating to or espousing operationalism | - |
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| operationally | (adverb) in respect to operation | - |
|---|
| 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 | (adjective) being in force or having or exerting force | - |
|---|
| (adjective) relating to or requiring or amenable to treatment by surgery especially as opposed to medicine | Synonyms: surgical |
| (adjective) (of e.g. a machine) performing or capable of performing | Synonyms: functional, running, working |
| (adjective) effective; producing a desired effect | - |
| (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 |
| (noun) a person secretly employed in espionage for a government | Synonyms: intelligence agent, intelligence officer, secret agent |
| operatively | (adverb) in a manner to produce an effect | - |
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| operator | (noun) an agent that operates some apparatus or machine | Synonyms: manipulator |
|---|
| (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 | - |
| operculate | (adjective) having an operculum | Synonyms: operculated |
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| operculated | (adjective) having an operculum | Synonyms: operculate |
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| 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 |
|---|
| operon | (noun) a segment of DNA containing adjacent genes including structural genes and an operator gene and a regulatory gene | - |
|---|
| operose | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, punishing, toilsome |
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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 | - |
|---|
| orchiopexy | (noun) operation to bring an undescended testicle into the scrotum | - |
|---|
| orthopedic | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedical |
|---|
| orthopedical | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedic |
|---|
| orthopedics | (noun) the branch of medical science concerned with disorders or deformities of the spine and joints | Synonyms: orthopaedics |
|---|
| 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 | - |
|---|
| oscilloscope | (noun) electronic equipment that provides visual images of varying electrical quantities | Synonyms: cathode-ray oscilloscope, CRO, scope |
|---|
| 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 |
|---|
| 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 |
|---|
| 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 | - |
|---|
| paratrooper | (noun) a soldier in the paratroops | Synonyms: para |
|---|
| periscope | (noun) an optical instrument that provides a view of an otherwise obstructed field | - |
|---|
| phalarope | (noun) small sandpiper-like shorebird having lobate toes and being good swimmers; breed in the Arctic and winter in the tropics | - |
|---|
| pharmacopeia | (noun) (pharmacology) a book containing a compilation of pharmaceutical products with their formulas and methods of preparation | Synonyms: formulary |
|---|
| polariscope | (noun) an optical device used to measure the rotation of the plane of vibration of polarized light | Synonyms: polarimeter |
|---|
| polypropene | (noun) a polymer of propylene used as a thermoplastic molding material | Synonyms: polypropylene |
|---|
| polypropenonitrile | (noun) acrylic resin used to make a strong soft crease-resistant fabric (trade name Acrilan) | Synonyms: Acrilan |
|---|
| pope | (noun) the head of the Roman Catholic Church | Synonyms: Bishop of Rome, Catholic Pope, Holy Father, pontiff, Roman Catholic Pope, Vicar of Christ |
|---|
| popery | (noun) offensive terms for the practices and rituals of the Roman Catholic Church | Synonyms: papism |
|---|
| popeyed | (adjective) having bulging eyes | - |
|---|
| (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, openmouthed |
| postoperative | (adjective) happening or done after a surgical operation | - |
|---|
| postoperatively | (adverb) after the operation | - |
|---|
| preoperative | (adjective) happening or done before and in preparation for a surgical operation | - |
|---|
| presbyope | (noun) a person with presbyopia; someone who is farsighted resulting from the progressive loss with aging of the elasticity of the crystalline lens | - |
|---|
| proctoscope | (noun) an endoscope for examining the rectum | - |
|---|
| propel | (verb) cause to move forward with force | Synonyms: impel |
|---|
| (verb) give an incentive for action | Synonyms: actuate, incite, motivate, move, prompt |
| propellant | (adjective) tending to or capable of propelling | Synonyms: propellent, propelling, propulsive |
|---|
| (noun) any substance that propels | Synonyms: propellent |
| propellent | (adjective) tending to or capable of propelling | Synonyms: propellant, propelling, propulsive |
|---|
| (noun) any substance that propels | Synonyms: propellant |