| leukopenia | (noun) an abnormal lowering of the white blood cell count | Synonyms: leucopenia |
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| limper | (noun) someone who has a limp and walks with a hobbling gait | Synonyms: hobbler |
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| limpet | (noun) any of various usually marine gastropods with low conical shells; found clinging to rocks in littoral areas | - |
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| (noun) mollusk with a low conical shell | - |
| linendraper | (noun) a retail dealer in yard goods | - |
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| lipectomy | (noun) plastic surgery involving the breakdown and removal of fatty tissue | Synonyms: selective lipectomy |
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| lipemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, hyperlipoidemia, lipaemia, lipidaemia, lipidemia, lipoidaemia, lipoidemia |
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| lisper | (noun) a speaker who lisps | - |
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| lockkeeper | (noun) a worker in charge of a lock (on a canal) | Synonyms: lockman, lockmaster |
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| logotype | (noun) a company emblem or device | Synonyms: logo |
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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 |
| lopper | (noun) a long-handled pruning saw with a curved blade at the end and sometimes a clipper; used to prune small trees | Synonyms: pruner, pruning hook |
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| loudspeaker | (noun) electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance | Synonyms: loudspeaker system, speaker, speaker system, speaker unit |
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| loupe | (noun) small magnifying glass (usually set in an eyepiece) used by jewelers and horologists | Synonyms: jeweler's loupe |
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| lumpectomy | (noun) surgical removal of a tumor without removing much of the surrounding tissue or lymph nodes; performed in some cases of breast cancer | - |
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| lumpenproletariat | (noun) (Marxism) the unorganized lower levels of the proletariat who are not interested in revolutionary advancement | - |
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| lumper | (noun) a taxonomist who classifies organisms into large groups on the basis of major characteristics | - |
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| (noun) a laborer who loads and unloads vessels in a port | Synonyms: dock-walloper, dock worker, docker, dockhand, dockworker, loader, longshoreman, stevedore |
| 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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| mapper | (noun) a clerk who marks data on a chart | Synonyms: plotter |
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| mastopexy | (noun) plastic surgery to lift or reshape the breasts | - |
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| maxilliped | (noun) One of a set of three paired appendages on the thorax of a decapod crustacean, located just posterior to the maxillae and used in feeding. | Synonyms: gnathopod |
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| meperidine | (noun) a synthetic narcotic drug (trade name Demerol) used to treat pain | Synonyms: Demerol, meperidine hydrochloride |
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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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| millepede | (noun) any of numerous herbivorous nonpoisonous arthropods having a cylindrical body of 20 to 100 or more segments most with two pairs of legs | Synonyms: milliped, millipede |
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| milliampere | (noun) one thousandth of an ampere | Synonyms: mA |
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| milliped | (noun) any of numerous herbivorous nonpoisonous arthropods having a cylindrical body of 20 to 100 or more segments most with two pairs of legs | Synonyms: millepede, millipede |
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| millipede | (noun) any of numerous herbivorous nonpoisonous arthropods having a cylindrical body of 20 to 100 or more segments most with two pairs of legs | Synonyms: millepede, milliped |
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| minesweeper | (noun) ship equipped to detect and then destroy or neutralize or remove marine mines | - |
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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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| misshapenness | (noun) an affliction in which some part of the body is misshapen or malformed | Synonyms: deformity, malformation |
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| misspelling | (noun) a spelling that is incorrect | - |
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| monotype | (noun) a typesetting machine operated from a keyboard that sets separate characters | - |
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| (noun) the sole print made by pressing paper against a painted or inked glass or metal plate | - |
| (noun) (biology) a taxonomic group with a single member (a single species or genus) | - |
| mope | (noun) someone who wastes time | Synonyms: dallier, dilly-dallier, dillydallier, lounger |
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| 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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| mopper | (noun) a worker who uses a mop to clean a surface | - |
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| moppet | (noun) a little girl (usually one you are fond of) | - |
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| mudskipper | (noun) found in tropical coastal regions of Africa and Asia; able to move on land on strong pectoral fins | Synonyms: mudspringer |
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| myope | (noun) a person with myopia; a nearsighted person | - |
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| nape | (noun) the back side of the neck | Synonyms: nucha, scruff |
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| napery | (noun) linens for the dining table | Synonyms: table linen |
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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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| netkeeper | (noun) the defensive position on an ice hockey or soccer or lacrosse team who stands in front of the goal and tries to prevent opposing players from scoring | Synonyms: goalie, goalkeeper, goaltender |
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| (noun) the soccer or hockey player assigned to protect the goal | Synonyms: goalie, goalkeeper, goaltender, netminder |
| neutropenia | (noun) leukopenia in which the decrease is primarily in number of neutrophils (the chief phagocytic leukocyte) | - |
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| newspaper | (noun) the physical object that is the product of a newspaper publisher | Synonyms: paper |
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| (noun) a daily or weekly publication on folded sheets; contains news and articles and advertisements | Synonyms: paper |
| (noun) a business firm that publishes newspapers | Synonyms: newspaper publisher, paper |
| (noun) cheap paper made from wood pulp and used for printing newspapers | Synonyms: newsprint |
| newspapering | (noun) journalism practiced for the newspapers | - |
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| newspaperman | (noun) a male journalist employed to provide news stories for newspapers or broadcast media | Synonyms: pressman |
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| newspaperwoman | (noun) a female journalist employed to provide news stories for newspapers or broadcast media | - |
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| newspeak | (noun) deliberately ambiguous and contradictory language used to mislead and manipulate the public | - |
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| newsperson | (noun) a person who investigates and reports or edits news stories | Synonyms: reporter |
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| ninepence | (noun) a coin worth nine pennies | - |
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| nipper | (noun) a grasping structure on the limb of a crustacean or other arthropods | Synonyms: chela, claw, pincer |
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| (noun) a young person of either sex | Synonyms: child, fry, kid, minor, nestling, shaver, small fry, tiddler, tike, tyke, youngster |
| nonappearance | (noun) failure to appear (especially as at court) | - |
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| nonperformance | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, neglect, negligence |
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| nonperson | (noun) a person regarded as nonexistent and having no rights; a person whose existence is systematically ignored (especially for ideological or political reasons) | Synonyms: unperson |
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| notepaper | (noun) writing paper intended for writing short notes or letters | - |
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| obstreperousness | (noun) noisy defiance | - |
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| oesophagoscope | (noun) an optical instrument for examining the inside of the esophagus | Synonyms: esophagoscope |
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| oilpaper | (noun) paper that has been made translucent and waterproof by soaking in oil | - |
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| oligospermia | (noun) insufficient spermatozoa in the semen | - |
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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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| outdoorsperson | (noun) a person who spends time outdoors (e.g., hunting or fishing) | - |
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| overcompensation | (noun) excessive compensation | - |
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| (noun) (psychiatry) an attempt to overcome a real or imagined defect or unwanted trait by overly exaggerating its opposite | - |
| palpebra | (noun) either of two folds of skin that can be moved to cover or open the eye | Synonyms: eyelid, lid |
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| palpebration | (noun) repeated blinking or winking (especially if uncontrolled and persistent) | - |
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| pamperer | (noun) someone who pampers or spoils by excessive indulgence | Synonyms: coddler, mollycoddler, spoiler |
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| pampering | (noun) the act of indulging or gratifying a desire | Synonyms: humoring, humouring, indulgence, indulging |
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