| mi | (noun) the syllable naming the third (mediant) note of any major scale in solmization | - |
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| (noun) a unit of length equal to 1,760 yards or 5,280 feet; exactly 1609.344 meters | Synonyms: international mile, land mile, mile, stat mi, statute mile |
| (noun) a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude | Synonyms: air mile, international nautical mile, mile, naut mi, nautical mile |
| (noun) a former British unit of length equivalent to 6,080 feet (1,853.184 meters); 800 feet longer than a statute mile | Synonyms: Admiralty mile, geographical mile, mile, naut mi, nautical mile |
| miaou | (noun) the sound made by a cat (or any sound resembling this) | Synonyms: meow, mew, miaow, miaul |
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| miaow | (noun) the sound made by a cat (or any sound resembling this) | Synonyms: meow, mew, miaou, miaul |
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| miasm | (noun) unhealthy vapors rising from the ground or other sources | Synonyms: miasma |
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| (noun) an unwholesome atmosphere | Synonyms: miasma |
| miasma | (noun) unhealthy vapors rising from the ground or other sources | Synonyms: miasm |
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| (noun) an unwholesome atmosphere | Synonyms: miasm |
| miaul | (noun) the sound made by a cat (or any sound resembling this) | Synonyms: meow, mew, miaou, miaow |
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| mic | (noun) device for converting sound waves into electrical energy | Synonyms: microphone, mike |
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| mica | (noun) any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity | Synonyms: isinglass |
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| micelle | (noun) an electrically charged particle built up from polymeric molecules or ions and occurring in certain colloidal electrolytic solutions like soaps and detergents | - |
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| mickle | (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
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| miconazole | (noun) an antifungal agent usually administered in the form of a nitrate (trade name Monistat) | Synonyms: Monistat |
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| microbalance | (noun) balance for weighing very small objects | - |
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| microbar | (noun) the absolute unit of pressure equal to one dyne per square centimeter | Synonyms: bar absolute, barye |
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| microbat | (noun) typically having large ears and feeding primarily on insects; worldwide in distribution | Synonyms: carnivorous bat |
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| microbe | (noun) a minute life form (especially a disease-causing bacterium); the term is not in technical use | Synonyms: bug, germ |
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| microbenthos | (noun) microscopic benthic organisms that are less than 0.1 mm in size. | - |
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| microbiologist | (noun) a specialist in microbiology | - |
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| microbiology | (noun) the branch of biology that studies microorganisms and their effects on humans | - |
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| microblog | (noun) a blog in which there is a limitation on the length of individual postings. | - |
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| microbrachia | (noun) abnormally small arms | - |
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| microbrewery | (noun) a small brewery; consumption of the product is mainly elsewhere | - |
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| microcephalus | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephaly, nanocephaly |
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| microcephaly | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephalus, nanocephaly |
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| microchip | (noun) electronic equipment consisting of a small crystal of a silicon semiconductor fabricated to carry out a number of electronic functions in an integrated circuit | Synonyms: chip, micro chip, microprocessor chip, silicon chip |
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| microcircuit | (noun) a microelectronic computer circuit incorporated into a chip or semiconductor; a whole system rather than a single component | Synonyms: integrated circuit |
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| microcode | (noun) (computer science) coded instructions that are stored permanently in read-only memory | Synonyms: firmware |
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| microcomputer | (noun) a small digital computer based on a microprocessor and designed to be used by one person at a time | Synonyms: PC, personal computer |
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| microcosm | (noun) a miniature model of something | - |
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| microcrystal | (noun) any crystal of microscopic size. | - |
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| microcyte | (noun) an abnormally small red blood cell (less than 5 microns in diameter) | - |
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| microcytosis | (noun) a blood disorder characterized by the presence of microcytes (abnormally small red blood cells) in the blood; often associated with anemia | - |
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| microdevice | (noun) any very small device manufactured using microfabrication. | - |
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| microdot | (noun) photograph reduced to the size of a dot (usually for purposes of security) | - |
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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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| microevolution | (noun) evolution resulting from small specific genetic changes that can lead to a new subspecies | - |
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| microfarad | (noun) a unit of capacitance equal to one millionth of a farad | - |
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| microfiche | (noun) small sheet of microfilm on which many pages of material have been photographed; a magnification system is used to read the material | - |
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| microfilm | (noun) film on which materials are photographed at greatly reduced size; useful for storage; a magnification system is used to read the material | - |
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| microflora | (noun) microscopic plants; bacteria are often considered to be microflora | - |
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| microfossil | (noun) a fossil that must be studied microscopically | - |
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| microgametophyte | (noun) the male gametophyte produced by a microspore | - |
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| microgauss | (noun) a unit of magnetic flux density equal to one millionth of a gauss | - |
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| microglia | (noun) neuroglial tissue of mesodermal origin that can become phagocytic | - |
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| microgliacyte | (noun) a cell of the microglia that may become phagocytic and collect waste products of nerve tissue | - |
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| microgram | (noun) one millionth (1/1,000,000) gram | Synonyms: mcg |
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| micrograph | (noun) a graphic reproduction (as a photograph) of the image of an object formed by a microscope. | - |
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| micrometeor | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeorite, micrometeoroid |
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| micrometeorite | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeor, micrometeoroid |
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| micrometeoroid | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeor, micrometeorite |
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| micrometer | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometre, micron |
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| (noun) caliper for measuring small distances | Synonyms: micrometer caliper, micrometer gauge |
| micrometre | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micron |
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| micrometry | (noun) measuring with a micrometer | - |
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| micromicron | (noun) a metric unit of length equal to one trillionth of a meter | Synonyms: picometer, picometre |
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| micromillimeter | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimetre, millimicron, nanometer, nanometre, nm |
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| micromillimetre | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, millimicron, nanometer, nanometre, nm |
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| micron | (noun) a metric unit of length equal to one millionth of a meter | Synonyms: micrometer, micrometre |
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| micronutrient | (noun) a substance needed only in small amounts for normal body function (e.g., vitamins or minerals) | - |
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| microorganism | (noun) any organism of microscopic size | Synonyms: micro-organism |
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| micropaleontology | (noun) the paleontology of microfossils | - |
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| micropenis | (noun) an abnormally small penis | Synonyms: microphallus |
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| microphage | (noun) a neutrophil that ingests small things (as bacteria) | - |
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| microphallus | (noun) an abnormally small penis | Synonyms: micropenis |
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| microphone | (noun) device for converting sound waves into electrical energy | Synonyms: mic, mike |
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| microphoning | (noun) the transduction of sound waves into electrical waves (by a microphone) | - |
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| microphotometer | (noun) special kind of densitometer that measures density variations over a very small area | - |
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| microprint | (noun) extremely small print, read by a magnifying device. | - |
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| microprocessor | (noun) integrated circuit semiconductor chip that performs the bulk of the processing and controls the parts of a system | - |
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| micropyle | (noun) minute opening in the wall of an ovule through which the pollen tube enters | - |
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| microradian | (noun) a unit of angular distance equal to one thousandth of a milliradian | - |
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| microscope | (noun) magnifier of the image of small objects | - |
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| microscopist | (noun) a scientist who specializes in research with the use of microscopes | - |
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| microscopy | (noun) research with the use of microscopes | - |
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| microsecond | (noun) one millionth (10^-6) of a second; one thousandth of a millisecond | - |
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| microseism | (noun) a small earthquake | Synonyms: earth tremor, tremor |
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| microsensor | (noun) A submicrometer- to millimeter-size device that converts a nonelectrical physical or chemical quantity, such as pressure, acceleration, temperature, or gas concentration, into an electrical signal; it is generally able to offer better sensitivity, accuracy, dynamic range, and reliability, as well as lower power consumption, compared to larger counterparts. | - |
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| microsome | (noun) a tiny granule in the cytoplasm that is where protein synthesis takes place under the direction of mRNA | - |
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| microsporangium | (noun) a plant structure that produces microspores | - |
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| microspore | (noun) smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte | - |
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| microsporidian | (noun) parasite of arthropods and fishes that invade and destroy host cells | - |
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| microsporophyll | (noun) in non-flowering plants, a sporophyll that bears only microsporangia | - |
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| microsurgery | (noun) surgery using operating microscopes and miniaturized precision instruments to perform intricate procedures on very small structures | - |
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| microtome | (noun) scientific instrument that cuts thin slices of something for microscopic examination | - |
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| microtoponym | (noun) a name of a "minor" or small natural feature (e.g., a field, path, bridge, ditch, etc.). | - |
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| microtubule | (noun) a microscopically small tubule | - |
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| microvolt | (noun) a unit of potential equal to one millionth of a volt | - |
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| microwave | (noun) kitchen appliance that cooks food by passing an electromagnetic wave through it; heat results from the absorption of energy by the water molecules in the food | Synonyms: microwave oven |
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| (noun) a short electromagnetic wave (longer than infrared but shorter than radio waves); used for radar and microwave ovens and for transmitting telephone, facsimile, video and data | - |
| micturition | (noun) the discharge of urine | Synonyms: urination |
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| midafternoon | (noun) the middle part of the afternoon | - |
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| midair | (noun) some point in the air; above ground level | - |
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| midazolam | (noun) an injectable form of benzodiazepine (trade name Versed) useful for sedation and for reducing pain during uncomfortable medical procedures | Synonyms: Versed |
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| midbrain | (noun) the middle portion of the brain | Synonyms: mesencephalon |
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| midday | (noun) the middle of the day | Synonyms: high noon, noon, noonday, noontide, twelve noon |
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| midden | (noun) a heap of dung or refuse | Synonyms: dunghill, muckheap, muckhill |
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| (noun) (archeology) a mound of domestic refuse containing shells and animal bones marking the site of a prehistoric settlement | Synonyms: eitchen midden, kitchen midden |
| middle | (noun) the middle area of the human torso (usually in front) | Synonyms: midriff, midsection |
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| (noun) an intermediate part or section | - |
| (noun) an area that is approximately central within some larger region | Synonyms: center, centre, eye, heart |
| (noun) the point between the beginning and the end of a temporal period or process | - |
| middlebreaker | (noun) moldboard plow with a double moldboard designed to move dirt to either side of a central furrow | Synonyms: lister, lister plough, lister plow, middle buster |
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| middlebrow | (noun) someone who is neither a highbrow nor a lowbrow | - |
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| middleman | (noun) a person who is in a position to give you special assistance | Synonyms: contact |
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| (noun) someone who buys large quantities of goods and resells to merchants rather than to the ultimate customers | Synonyms: jobber, wholesaler |
| (noun) the performer in the middle of a minstrel line who engages the others in talk | Synonyms: interlocutor |
| middleweight | (noun) a professional boxer who weighs between 155 and 160 pounds | - |
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| (noun) a wrestler who weighs 172-192 pounds | - |
| (noun) an amateur boxer who weighs no more than 165 pounds | - |