| lymphangiectasia | (noun) dilatation of a lymph vessel | Synonyms: lymphangiectasis |
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| lymphangiectasis | (noun) dilatation of a lymph vessel | Synonyms: lymphangiectasia |
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| macroeconomics | (noun) the branch of economics that studies the overall working of a national economy | - |
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| macroeconomist | (noun) an economist who specializes in macroeconomics | Synonyms: macroeconomic expert |
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| macromolecule | (noun) any very large complex molecule; found only in plants and animals | Synonyms: supermolecule |
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| mantelpiece | (noun) shelf that projects from wall above fireplace | Synonyms: chimneypiece, mantel, mantle, mantlepiece |
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| mantlepiece | (noun) shelf that projects from wall above fireplace | Synonyms: chimneypiece, mantel, mantelpiece, mantle |
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| mastectomy | (noun) surgical removal of a breast to remove a malignant tumor | - |
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| masterpiece | (noun) an outstanding achievement | - |
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| (noun) the most outstanding work of a creative artist or craftsman | Synonyms: chef-d'oeuvre |
| mastoidectomy | (noun) surgical removal of some or all of the mastoid process | - |
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| mecca | (noun) a place that attracts many visitors | - |
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| mechanic | (noun) a craftsman skilled in operating machine tools | Synonyms: machinist, shop mechanic |
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| (noun) someone whose occupation is repairing and maintaining automobiles | Synonyms: auto-mechanic, automobile mechanic, car-mechanic, grease monkey |
| mechanics | (noun) the technical aspects of doing something | Synonyms: mechanism |
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| (noun) the branch of physics concerned with the motion of bodies in a frame of reference | - |
| mechanisation | (noun) the act of implementing the control of equipment with advanced technology; usually involving electronic hardware | Synonyms: automation, mechanization |
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| (noun) the condition of having a highly technical implementation | Synonyms: mechanization |
| mechanism | (noun) the technical aspects of doing something | Synonyms: mechanics |
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| (noun) device consisting of a piece of machinery; has moving parts that perform some function | - |
| (noun) (philosophy) the philosophical theory that all phenomena can be explained in terms of physical or biological causes | - |
| (noun) a natural object resembling a machine in structure or function | - |
| (noun) the atomic process that occurs during a chemical reaction | Synonyms: chemical mechanism |
| mechanist | (noun) a philosopher who subscribes to the doctrine of mechanism | - |
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| mechanization | (noun) the act of implementing the control of equipment with advanced technology; usually involving electronic hardware | Synonyms: automation, mechanisation |
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| (noun) the condition of having a highly technical implementation | Synonyms: mechanisation |
| meclizine | (noun) an antihistamine (trade name Antivert) used to treat or prevent motion sickness | Synonyms: Antivert, meclizine hydrochloride |
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| meclofenamate | (noun) a nonsteroidal anti-inflammatory (trade name Meclomen) used to treat arthritis | Synonyms: meclofenamate sodium, Meclomen |
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| meconium | (noun) thick dark green mucoid material that is the first feces of a newborn child | - |
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| mecopteran | (noun) any of various carnivorous insects of the order Mecoptera | - |
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| meniscectomy | (noun) surgical removal of the meniscus of the knee | - |
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| microeconomics | (noun) the branch of economics that studies the economy of consumers or households or individual firms | - |
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| microeconomist | (noun) an economist who specializes in microeconomics | Synonyms: microeconomic expert |
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| microelectronics | (noun) the branch of electronics that deals with miniature components | - |
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| microsecond | (noun) one millionth (10^-6) of a second; one thousandth of a millisecond | - |
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| midsection | (noun) the middle area of the human torso (usually in front) | Synonyms: middle, midriff |
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| millisecond | (noun) one thousandth (10^-3) of a second | Synonyms: msec |
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| misdirection | (noun) management that is careless or inefficient | Synonyms: mismanagement |
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| (noun) the act of distracting; drawing someone's attention away from something | Synonyms: distraction |
| (noun) incorrect directions or instructions | - |
| (noun) an incorrect charge to a jury given by a judge | - |
| misreckoning | (noun) a mistake in calculating | Synonyms: miscalculation, misestimation |
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| molecule | (noun) (physics and chemistry) the simplest structural unit of an element or compound | - |
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| (noun) (nontechnical usage) a tiny piece of anything | Synonyms: atom, corpuscle, mote, particle, speck |
| mouthpiece | (noun) the aperture of a wind instrument into which the player blows directly | Synonyms: embouchure |
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| (noun) the tube of a pipe or cigarette holder that a smoker holds in the mouth | - |
| (noun) an acoustic device; the part of a telephone into which a person speaks | - |
| (noun) (especially boxing) equipment that protects an athlete's mouth | Synonyms: gumshield |
| (noun) a part that goes over or into the mouth of a person | - |
| (noun) a spokesperson (as a lawyer) | Synonyms: mouth |
| msec | (noun) one thousandth (10^-3) of a second | Synonyms: millisecond |
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| myonecrosis | (noun) localized death of muscle cell fibers | - |
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| myringectomy | (noun) surgical removal of the eardrum | - |
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| myrmecophile | (noun) an organism such as an insect that habitually shares the nest of a species of ant | - |
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| myrmecophyte | (noun) plant that affords shelter or food to ants that live in symbiotic relations with it | - |
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| nanosecond | (noun) one billionth (10^-9) of a second; one thousandth of a microsecond | - |
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| nanotechnology | (noun) the branch of engineering that deals with things smaller than 100 nanometers (especially with the manipulation of individual molecules) | - |
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| nebbech | (noun) (Yiddish) a timid unfortunate simpleton | Synonyms: nebbish |
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| necessary | (noun) anything indispensable | Synonyms: essential, necessity, requirement, requisite |
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| necessitarian | (noun) someone who does not believe the doctrine of free will | - |
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| necessity | (noun) anything indispensable | Synonyms: essential, necessary, requirement, requisite |
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| (noun) the condition of being essential or indispensable | - |
| neck | (noun) an opening in a garment for the neck of the wearer; a part of the garment near the wearer's neck | Synonyms: neck opening |
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| (noun) a narrow part of an artifact that resembles a neck in position or form | - |
| (noun) the part of an organism (human or animal) that connects the head to the rest of the body | Synonyms: cervix |
| (noun) a cut of meat from the neck of an animal | - |
| (noun) a narrow elongated projecting strip of land | - |
| neckband | (noun) a band that fits around the neck and is usually folded over | Synonyms: collar |
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| (noun) necklace that fits tightly around a woman's neck | Synonyms: choker, collar, dog collar |
| (noun) a band around the collar of a garment | - |
| neckcloth | (noun) an ornamental white cravat | Synonyms: stock |
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| necker | (noun) a lover who necks | - |
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| neckerchief | (noun) a kerchief worn around the neck | - |
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| necking | (noun) affectionate play (or foreplay without contact with the genital organs) | Synonyms: caressing, cuddling, fondling, hugging, kissing, petting, smooching, snuggling |
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| (noun) the molding at the top of a column | Synonyms: gorgerin |
| necklace | (noun) jewelry consisting of a cord or chain (often bearing gems) worn about the neck as an ornament (especially by women) | - |
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| necklet | (noun) decoration worn about the neck (fur piece or tight necklace) as an ornament | - |
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| neckline | (noun) the line formed by the edge of a garment around the neck | - |
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| neckpiece | (noun) an article of apparel worn about the neck | - |
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| necktie | (noun) neckwear consisting of a long narrow piece of material worn (mostly by men) under a collar and tied in knot at the front | Synonyms: tie |
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| neckwear | (noun) articles of clothing worn about the neck | - |
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| necrobiosis | (noun) (physiology) the normal degeneration and death of living cells (as in various epithelial cells) | Synonyms: cell death |
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| necrolatry | (noun) superstitious worship or veneration of the dead. | - |
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| necrology | (noun) a notice of someone's death; usually includes a short biography | Synonyms: obit, obituary |
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| (noun) a list of people who died recently | - |
| necrolysis | (noun) disintegration and dissolution of dead tissue | - |
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| necromancer | (noun) one who practices magic or sorcery | Synonyms: magician, sorcerer, thaumaturge, thaumaturgist, wizard |
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| (noun) one who practices divination by conjuring up the dead | - |
| necromancy | (noun) conjuring up the dead, especially for prophesying | - |
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| (noun) the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world | Synonyms: black art, black magic, sorcery |
| necromania | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necrophilia, necrophilism |
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| necrophagia | (noun) feeding on corpses or carrion | Synonyms: necrophagy |
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| necrophagy | (noun) feeding on corpses or carrion | Synonyms: necrophagia |
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| necrophilia | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necromania, necrophilism |
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| necrophilism | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necromania, necrophilia |
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| necropolis | (noun) a tract of land used for burials | Synonyms: burial ground, burial site, burying ground, cemetery, graveyard, memorial park |
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| necropsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: autopsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| necrosis | (noun) the localized death of living cells (as from infection or the interruption of blood supply) | Synonyms: gangrene, mortification, sphacelus |
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| nectar | (noun) (classical mythology) the food and drink of the gods; mortals who ate it became immortal | Synonyms: ambrosia |
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| (noun) fruit juice especially when undiluted | - |
| (noun) a sweet liquid secretion that is attractive to pollinators | - |
| nectarine | (noun) a variety or mutation of the peach that has a smooth skin | - |
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| (noun) variety or mutation of the peach bearing fruit with smooth skin and (usually) yellow flesh | Synonyms: nectarine tree, Prunus persica nectarina |
| nectary | (noun) a gland (often a protuberance or depression) that secretes nectar | Synonyms: honey gland |
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| needlecraft | (noun) work (such as sewing or embroidery) that is done with a needle | Synonyms: needlework |
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| (noun) a creation created or assembled by needle and thread | Synonyms: needlework |
| neglect | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, negligence, nonperformance |
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| (noun) willful lack of care and attention | Synonyms: disregard |
| (noun) the trait of neglecting responsibilities and lacking concern | Synonyms: neglectfulness, negligence |
| (noun) lack of attention and due care | Synonyms: disregard |
| (noun) the state of something that has been unused and neglected | Synonyms: disuse |
| neglecter | (noun) a person who is neglectful and gives little attention or respect to people or responsibilities | - |
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| neglectfulness | (noun) the trait of neglecting responsibilities and lacking concern | Synonyms: neglect, negligence |
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| nephrectomy | (noun) surgical removal of a kidney | - |
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| neurectomy | (noun) surgical removal of all or part of a nerve | - |
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| niece | (noun) a daughter of your brother or sister | - |
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| nosecount | (noun) a periodic count of the population | Synonyms: census, nose count |
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| nosepiece | (noun) the link between two lenses; rests on the nose | Synonyms: bridge |
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| (noun) armor plate that protects the nose | - |
| (noun) a strap that is the part of a bridle that goes over the animal's nose | Synonyms: noseband |
| notecase | (noun) a pocket-size case for holding papers and paper money | Synonyms: billfold, pocketbook, wallet |
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| obeche | (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood | Synonyms: arere, obechi, samba, Triplochiton scleroxcylon |
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| (noun) the wood of an African obeche tree; used especially for veneering | - |
| obechi | (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood | Synonyms: arere, obeche, samba, Triplochiton scleroxcylon |
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| object | (noun) a tangible and visible entity; an entity that can cast a shadow | Synonyms: physical object |
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| (noun) the goal intended to be attained (and which is believed to be attainable) | Synonyms: aim, objective, target |
| (noun) the focus of cognitions or feelings | - |
| (noun) (computing) a discrete item that provides a description of virtually anything known to a computer | - |
| (noun) (grammar) a constituent that is acted upon | - |
| objectification | (noun) the act of representing an abstraction as a physical thing | - |
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| (noun) a concrete representation of an abstract idea or principle | - |
| objection | (noun) (law) a procedure whereby a party to a suit says that a particular line of questioning or a particular witness or a piece of evidence or other matter is improper and should not be continued and asks the court to rule on its impropriety or illegality | - |
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| (noun) the act of protesting; a public (often organized) manifestation of dissent | Synonyms: dissent, protest |
| (noun) the speech act of objecting | - |
| (noun) the act of expressing earnest opposition or protest | Synonyms: expostulation, remonstrance, remonstration |
| objectionableness | (noun) the quality of being hateful | Synonyms: hatefulness, obnoxiousness |
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| objective | (noun) the lens or system of lenses in a telescope or microscope that is nearest the object being viewed | Synonyms: object glass, object lens, objective lens |
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| (noun) the goal intended to be attained (and which is believed to be attainable) | Synonyms: aim, object, target |
| objectiveness | (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices | Synonyms: objectivity |
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| objectivity | (noun) judgment based on observable phenomena and uninfluenced by emotions or personal prejudices | Synonyms: objectiveness |
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| objectivization | (noun) the act or process of making or becoming objective. | - |
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| objector | (noun) a person who dissents from some established policy | Synonyms: contestant, dissenter, dissident, protester |
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| oecumenism | (noun) a movement promoting union between religions (especially between Christian churches) | Synonyms: ecumenism |
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| olecranon | (noun) process of the ulna that forms the outer bump of the elbow and fits into the fossa of the humerus when the arm is extended | Synonyms: olecranon process |
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| oophorectomy | (noun) surgical removal of one or both ovaries | Synonyms: ovariectomy |
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| oophorosalpingectomy | (noun) surgical removal of one or both ovaries and the corresponding Fallopian tubes | - |
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| ophthalmectomy | (noun) surgical removal of an eye | - |
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| orchidectomy | (noun) surgical removal of one or both testicles | Synonyms: orchiectomy |
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| orchiectomy | (noun) surgical removal of one or both testicles | Synonyms: orchidectomy |
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