| 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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| medal | (noun) an award for winning a championship or commemorating some other event | Synonyms: decoration, laurel wreath, medallion, palm, ribbon |
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| medalist | (noun) (golf) the winner at medal play of a tournament | Synonyms: medal winner, medallist |
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| (noun) someone who has won a medal | Synonyms: medallist |
| medallion | (noun) an award for winning a championship or commemorating some other event | Synonyms: decoration, laurel wreath, medal, palm, ribbon |
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| (noun) an emblem indicating that a taxicab is registered | - |
| (noun) a circular helping of food (especially a boneless cut of meat) | - |
| (noun) a circular helping of food (especially a boneless cut of meat) "medallions of veal" | - |
| (noun) any of various large ancient Greek coins | - |
| medallist | (noun) (golf) the winner at medal play of a tournament | Synonyms: medal winner, medalist |
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| (noun) someone who has won a medal | Synonyms: medalist |
| meddler | (noun) an officious annoying person who interferes with others | - |
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| meddlesomeness | (noun) aggressiveness as evidenced by intruding; by advancing yourself or your ideas without invitation | Synonyms: intrusiveness, officiousness |
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| meddling | (noun) the act of altering something secretly or improperly | Synonyms: tampering |
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| medevac | (noun) the evacuation of persons (usually by air transportation) to a place where they can receive medical care | Synonyms: medical evacuation, medivac |
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| medfly | (noun) small black-and-white fly that damages citrus and other fruits by implanting eggs that hatch inside the fruit | Synonyms: Ceratitis capitata, Mediterranean fruit fly |
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| mediacy | (noun) the quality of being mediate | Synonyms: mediateness |
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| median | (noun) the number midway between the two middle numbers in a series containing an even or odd number of items | Synonyms: median value |
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| mediant | (noun) (music) the third note of a diatonic scale; midway between the tonic and the dominant | - |
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| mediastinum | (noun) the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus | - |
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| mediateness | (noun) the quality of being mediate | Synonyms: mediacy |
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| mediation | (noun) the act of intervening for the purpose of bringing about a settlement | Synonyms: intermediation |
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| (noun) a negotiation to resolve differences that is conducted by some impartial party | - |
| mediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, intermediator |
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| mediatrix | (noun) a woman who is a mediator | - |
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| medic | (noun) a medical practitioner in the armed forces | Synonyms: medical officer |
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| (noun) any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves | Synonyms: medick, trefoil |
| medical | (noun) a thorough physical examination; includes a variety of tests depending on the age and sex and health of the person | Synonyms: checkup, health check, medical checkup, medical exam, medical examination |
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| medicament | (noun) (medicine) something that treats or prevents or alleviates the symptoms of disease | Synonyms: medication, medicinal drug, medicine |
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| medication | (noun) the act of treating with medicines or remedies | - |
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| (noun) (medicine) something that treats or prevents or alleviates the symptoms of disease | Synonyms: medicament, medicinal drug, medicine |
| medicine | (noun) the learned profession that is mastered by graduate training in a medical school and that is devoted to preventing or alleviating or curing diseases and injuries | Synonyms: practice of medicine |
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| (noun) punishment for one's actions | Synonyms: music |
| (noun) (medicine) something that treats or prevents or alleviates the symptoms of disease | Synonyms: medicament, medication, medicinal drug |
| (noun) the branches of medical science that deal with nonsurgical techniques | Synonyms: medical specialty |
| medick | (noun) any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves | Synonyms: medic, trefoil |
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| medico | (noun) a licensed medical practitioner | Synonyms: doc, doctor, Dr., MD, physician |
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| (noun) a student in medical school | Synonyms: medical student |
| mediety | (noun) one of two (approximately) equal parts | Synonyms: moiety |
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| medievality | (noun) The quality of being of or relating to the Middle Ages, perhaps circa 500 to circa 1500 CE. | - |
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| medina | (noun) the ancient quarter of many cities in northern Africa | - |
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| mediocrity | (noun) ordinariness as a consequence of being average and not outstanding | Synonyms: averageness |
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| (noun) a person of second-rate ability or value | Synonyms: second-rater |
| meditation | (noun) continuous and profound contemplation or musing on a subject or series of subjects of a deep or abstruse nature | Synonyms: speculation |
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| (noun) (religion) contemplation of spiritual matters (usually on religious or philosophical subjects) | - |
| meditativeness | (noun) deep serious thoughtfulness | Synonyms: contemplativeness, pensiveness |
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| medium | (noun) an occupation for which you are especially well suited | Synonyms: metier |
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| (noun) an intervening substance through which signals can travel as a means for communication | - |
| (noun) a means or instrumentality for storing or communicating information | - |
| (noun) (usually plural) transmissions that are disseminated widely to the public | Synonyms: mass medium |
| (noun) the surrounding environment | - |
| (noun) someone who serves as an intermediary between the living and the dead | Synonyms: sensitive, spiritualist |
| (noun) a state that is intermediate between extremes; a middle position | - |
| (noun) (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms | Synonyms: culture medium |
| (noun) (biology) a substance in which specimens are preserved or displayed | - |
| (noun) a liquid with which pigment is mixed by a painter | - |
| (noun) an intervening substance through which something is achieved | - |
| medivac | (noun) the evacuation of persons (usually by air transportation) to a place where they can receive medical care | Synonyms: medevac, medical evacuation |
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| medlar | (noun) crabapple-like fruit used for preserves | - |
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| (noun) a South African globular fruit with brown leathery skin and pithy flesh having a sweet-acid taste | - |
| (noun) small deciduous Eurasian tree cultivated for its fruit that resemble crab apples | Synonyms: medlar tree, Mespilus germanica |
| (noun) small deciduous tree of southern Africa having edible fruit | Synonyms: Vangueria infausta, wild medlar, wild medlar tree |
| medley | (noun) a musical composition consisting of a series of songs or other musical pieces from various sources | Synonyms: pastiche, potpourri |
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| medroxyprogesterone | (noun) a progestin compound (trade name Provera) used to treat menstrual disorders | Synonyms: Provera |
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| medulla | (noun) the inner part of an organ or structure in plant or animal | - |
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| (noun) lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata) | Synonyms: bulb, medulla oblongata |
| (noun) a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers | Synonyms: myelin, myeline |
| medusa | (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusan, medusoid |
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| medusan | (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusa, medusoid |
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| medusoid | (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusa, medusan |
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| meed | (noun) a fitting reward | - |
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| meekness | (noun) a disposition to be patient and long suffering | Synonyms: subduedness |
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| (noun) the feeling of patient, submissive humbleness | Synonyms: submission |
| meerestone | (noun) an old term for a landmark that consisted of a pile of stones surmounted by an upright slab | Synonyms: mearstone, merestone |
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| meerkat | (noun) a mongoose-like viverrine of South Africa having a face like a lemur and only four toes | Synonyms: mierkat |
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| meerschaum | (noun) a pipe having a bowl made of meerschaum | - |
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| (noun) a white clayey mineral | Synonyms: sepiolite |
| meet | (noun) a meeting at which a number of athletic contests are held | Synonyms: sports meeting |
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| meeter | (noun) a person who is present and participates in a meeting | Synonyms: attendant, attendee, attender |
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| meeting | (noun) the social act of assembling for some common purpose | Synonyms: coming together, congress |
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| (noun) the act of joining together as one | Synonyms: coming together, merging |
| (noun) a casual or unexpected convergence | Synonyms: encounter |
| (noun) a formally arranged gathering | Synonyms: group meeting |
| (noun) a small informal social gathering | Synonyms: get together |
| (noun) a place where things merge or flow together (especially rivers) | Synonyms: confluence |
| meetinghouse | (noun) a building for religious assembly (especially Nonconformists, e.g., Quakers) | Synonyms: conventicle |
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| mefloquine | (noun) an antimalarial drug (trade name Lariam and Mephaquine) that is effective in cases that do not respond to chloroquine; said to produce harmful neuropsychiatric effects on some people | Synonyms: Lariam, mefloquine hydrochloride, Mephaquine |
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| meg | (noun) the number that is represented as a one followed by 6 zeros | Synonyms: 1000000, million, one thousand thousand |
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| megabat | (noun) large Old World bat of warm and tropical regions that feeds on fruit | Synonyms: fruit bat |
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| megabit | (noun) a unit of information equal to 1000 kilobits or 10^6 (1,000,000) bits | Synonyms: Mb, Mbit |
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| megabucks | (noun) a large sum of money (especially as pay or profit) | Synonyms: big bucks, big money, bundle, pile |
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| megabyte | (noun) a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes | Synonyms: M, MB, mebibyte, MiB |
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| (noun) a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes | Synonyms: M, MB |
| megacardia | (noun) an abnormal enlargement of the heart | Synonyms: cardiomegaly, enlarged heart, megalocardia |
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| megacephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: macrocephaly, megalocephaly |
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| megacolon | (noun) an abnormal enlargement of the colon; can be congenital (as in Hirschsprung's disease) or acquired (as when children refuse to defecate) | - |
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| megacycle | (noun) one million periods per second | Synonyms: Mc, megacycle per second, megahertz, MHz |
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| megadeath | (noun) the death of a million people | - |
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| megadose | (noun) an exceptionally large dose, as of a drug or vitamin. | - |
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| megaflop | (noun) (computer science) a unit for measuring the speed of a computer system, one megaflops is a million floating point operations per second | Synonyms: MFLOP, million floating point operations per second |
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| megagametophyte | (noun) the female gametophyte produced by the megaspore of a plant that produces both microspore and megaspores | - |
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| megahertz | (noun) one million periods per second | Synonyms: Mc, megacycle, megacycle per second, MHz |
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| megahit | (noun) an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel) | Synonyms: blockbuster, smash hit |
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| megakaryocyte | (noun) a large bone marrow cell; regarded as the source of blood platelets | - |
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| megalith | (noun) memorial consisting of a very large stone forming part of a prehistoric structure (especially in western Europe) | Synonyms: megalithic structure |
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| megaloblast | (noun) abnormally large red blood cell present in pernicious anemia and folic acid deficiency | - |
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| megalocardia | (noun) an abnormal enlargement of the heart | Synonyms: cardiomegaly, enlarged heart, megacardia |
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| megalocephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: macrocephaly, megacephaly |
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| megalocyte | (noun) abnormally large red blood cell (associated with pernicious anemia) | Synonyms: macrocyte |
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| megalohepatia | (noun) abnormal enlargement of the liver | Synonyms: hepatomegaly |
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| megalomania | (noun) a psychological state characterized by delusions of grandeur | - |
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| megalomaniac | (noun) a pathological egotist | - |
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| megalopolis | (noun) a very large urban complex (usually involving several cities and towns) | - |
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| megalosaur | (noun) gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe | Synonyms: megalosaurus |
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| megalosaurus | (noun) gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe | Synonyms: megalosaur |
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| megaphone | (noun) a cone-shaped acoustic device held to the mouth to intensify and direct the human voice | - |
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| megapode | (noun) large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs | Synonyms: mound-bird, mound bird, mound builder, scrub fowl |
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| megasporangium | (noun) a plant structure that produces megaspores | Synonyms: macrosporangium |
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| megaspore | (noun) larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte | Synonyms: macrospore |
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| megasporophyll | (noun) in non-flowering plants, a sporophyll that bears only megasporangia | - |
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| megathere | (noun) gigantic extinct terrestrial sloth-like mammal of the Pliocene and Pleistocene in America | Synonyms: ground sloth |
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| megatherian | (noun) a large extinct ground sloth | Synonyms: megatherian mammal, megatheriid |
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| megatheriid | (noun) a large extinct ground sloth | Synonyms: megatherian, megatherian mammal |
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| megaton | (noun) one million tons | - |
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| (noun) a measure of explosive power (of an atomic weapon) equal to that of one million tons of TNT | - |
| megawatt | (noun) a unit of power equal to one million watts | - |
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| megestrol | (noun) a synthetic progestational compound used to treat endometrial carcinoma | Synonyms: megestrol acetate |
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| megillah | (noun) (Yiddish) a long boring tediously detailed account | - |
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| megilp | (noun) a medium for oil-paints; linseed oil mixed with mastic varnish or turpentine | Synonyms: magilp |
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| megohm | (noun) a unit of resistance equal to one million ohms | - |
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| megrim | (noun) a severe recurring vascular headache; occurs more frequently in women than men | Synonyms: hemicrania, migraine, sick headache |
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