| 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 | - |
| (verb) cook or heat in a microwave oven | Synonyms: micro-cook, nuke, zap |
| micturate | (verb) eliminate urine | Synonyms: make, make water, pass water, pee-pee, pee, piddle, piss, puddle, relieve oneself, spend a penny, take a leak, urinate, wee-wee, wee |
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| micturition | (noun) the discharge of urine | Synonyms: urination |
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| mid | (adjective) used in combination to denote the middle | - |
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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 | (adjective) between an earlier and a later period of time | - |
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| (adjective) of a stage in the development of a language or literature between earlier and later stages | - |
| (adjective) being neither at the beginning nor at the end in a series | Synonyms: in-between, mediate |
| (adjective) equally distant from the extremes | Synonyms: center, centre, halfway, midway |
| (noun) the middle area of the human torso (usually in front) | Synonyms: midriff, midsection |
| (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 | - |
| (verb) put in the middle | - |
| 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 |
| middlemost | (adjective) being in the exact middle | Synonyms: midmost |
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| 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 | - |
| middling | (adjective) lacking exceptional quality or ability | Synonyms: average, fair, mediocre |
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| (noun) any commodity of intermediate quality or size (especially when coarse particles of ground wheat are mixed with bran) | - |
| (adverb) to certain extent or degree | Synonyms: fairly, jolly, moderately, passably, pretty, reasonably, somewhat |
| middy | (noun) blouse with a sailor collar | Synonyms: middy blouse |
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| midfield | (noun) (sports) the middle part of a playing field (as in football or lacrosse) | - |
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| midge | (noun) minute two-winged mosquito-like fly lacking biting mouthparts; appear in dancing swarms especially near water | - |
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| midget | (adjective) very small | Synonyms: bantam, diminutive, flyspeck, lilliputian, petite, tiny |
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| (noun) a person who is markedly small | Synonyms: dwarf, nanus |
| midgrass | (noun) any of various grasses of moderate height which covered the undisturbed prairie in the United States; includes most of the forage grasses of the temperate zone | - |
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| midi | (adjective) used of women's clothing having a hemline at mid-calf | - |
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| midinette | (noun) a Parisian salesgirl | - |
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| midiron | (noun) long iron with a nearly vertical face | Synonyms: two iron |
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| midland | (adjective) of or coming from the middle of a region or country | Synonyms: interior, upcountry |
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| (noun) the interior part of a country | - |
| midline | (noun) the median plane of the body (or some part of the body) | Synonyms: midplane |
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| midmost | (adjective) being in the exact middle | Synonyms: middlemost |
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| (adverb) the middle or central part or point | Synonyms: in the midst |
| midnight | (noun) 12 o'clock at night; the middle of the night | - |
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| midplane | (noun) the median plane of the body (or some part of the body) | Synonyms: midline |
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| midpoint | (noun) a point equidistant from the ends of a line or the extremities of a figure | Synonyms: center, centre |
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| midrib | (noun) the vein in the center of a leaf | Synonyms: midvein |
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| midriff | (noun) (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration | Synonyms: diaphragm |
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| (noun) the middle area of the human torso (usually in front) | Synonyms: middle, midsection |
| midsection | (noun) the middle area of the human torso (usually in front) | Synonyms: middle, midriff |
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| midshipman | (noun) a temporary rank held by young naval officers in training | - |
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| midships | (adverb) at or near or toward the center of a ship | Synonyms: amidship, amidships |
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| midspread | (noun) a measure of statistical dispersion, being equal to the difference between the upper and lower quartiles. | Synonyms: interquartile range, middle fifty |
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| midst | (noun) the location of something surrounded by other things | Synonyms: thick |
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| midstream | (noun) the middle of a stream | - |
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| midsummer | (noun) June 21, when the sun is at its northernmost point | Synonyms: June 21, summer solstice |
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| midterm | (noun) an examination administered in the middle of an academic term | Synonyms: midterm exam, midterm examination |
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| (noun) middle of an academic term or a political term in office | - |
| (noun) the middle of the gestation period | - |
| midvein | (noun) the vein in the center of a leaf | Synonyms: midrib |
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| midwatch | (noun) a watch during the night (as from midnight to 8 a.m.) | Synonyms: graveyard watch, middle watch, night watch |
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| midway | (adjective) equally distant from the extremes | Synonyms: center, centre, halfway, middle |
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| (noun) the place at a fair or carnival where sideshows and similar amusements are located | - |
| (adverb) at half the distance; at the middle | Synonyms: halfway |
| midweek | (noun) the middle of a week | - |
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| (adverb) in the middle of the week | - |
| midweekly | (adjective) occurring during the middle of the week | - |
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| midwestern | (adjective) of a region of the United States generally including Ohio, Indiana, Illinois, Iowa, Missouri, Kansas, Nebraska, and sometimes Michigan, Wisconsin, Minnesota | - |
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| midwife | (noun) a woman skilled in aiding the delivery of babies | Synonyms: accoucheuse |
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| midwifery | (noun) assisting women at childbirth | - |
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| (noun) the branch of medicine dealing with childbirth and care of the mother | Synonyms: OB, obstetrics, tocology |
| midwinter | (noun) the middle of winter | - |
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| mien | (noun) dignified manner or conduct | Synonyms: bearing, comportment, presence |
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| mierkat | (noun) a mongoose-like viverrine of South Africa having a face like a lemur and only four toes | Synonyms: meerkat |
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| mifepristone | (noun) an abortion-inducing drug (trade name RU 486) developed in France; when taken during the first five weeks of pregnancy it blocks the action of progesterone so that the uterus sloughs off the embryo | Synonyms: abortion pill, RU 486 |
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| miff | (noun) a state of irritation or annoyance | Synonyms: huff, seeing red |
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| (verb) cause to be annoyed | - |
| miffed | (adjective) aroused to impatience or anger | Synonyms: annoyed, irritated, nettled, peeved, pissed, pissed off, riled, roiled, steamed, stung |
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| might | (noun) physical strength | Synonyms: mightiness, power |
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| mightily | (adverb) (Southern regional intensive) very; to a great degree | Synonyms: mighty, powerful, right |
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| (adverb) powerfully or vigorously | - |
| mightiness | (noun) physical strength | Synonyms: might, power |
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| mighty | (adjective) having or showing great strength or force or intensity | - |
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| (adverb) (Southern regional intensive) very; to a great degree | Synonyms: mightily, powerful, right |
| mignonette | (noun) Mediterranean woody annual widely cultivated for its dense terminal spikelike clusters greenish or yellowish white flowers having an intense spicy fragrance | Synonyms: Reseda odorata, sweet reseda |
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| migraine | (noun) a severe recurring vascular headache; occurs more frequently in women than men | Synonyms: hemicrania, megrim, sick headache |
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| migrant | (adjective) habitually moving from place to place especially in search of seasonal work | Synonyms: migratory |
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| (noun) traveler who moves from one region or country to another | Synonyms: migrator |
| migrate | (verb) move from one country or region to another and settle there | Synonyms: transmigrate |
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| (verb) move periodically or seasonally | - |
| migration | (noun) the movement of persons from one country or locality to another | - |
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| (noun) the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding | - |
| (noun) (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule | - |
| (noun) a group of people migrating together (especially in some given time period) | - |
| migrational | (adjective) of or related to migration | - |
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| migrator | (noun) an animal (especially birds and fish) that travels between different habitats at particular times of the year | - |
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| (noun) traveler who moves from one region or country to another | Synonyms: migrant |
| migratory | (adjective) used of animals that move seasonally | - |
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| (adjective) habitually moving from place to place especially in search of seasonal work | Synonyms: migrant |
| mihrab | (noun) (Islam) a niche in the wall of a mosque that indicates the direction of Mecca | - |
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| (noun) (Islam) a design in the shape of niche in a Muslim prayer rug; during worship the niche must be pointed toward Mecca | - |
| mikado | (noun) the emperor of Japan; when regarded as a religious leader the emperor is called tenno | Synonyms: tenno |
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| mikagura | (noun) a type of formal ritual Shinto kagura dance. | - |
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| mike | (noun) device for converting sound waves into electrical energy | Synonyms: mic, microphone |
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| mikvah | (noun) (Hebrew) a ritual purification and cleansing bath that Orthodox Jews take on certain occasions (as before Sabbath or after menstruation) | - |
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| mil | (noun) a unit of length equal to one thousandth of an inch; used to specify thickness (e.g., of sheets or wire) | - |
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| (noun) a metric unit of volume equal to one thousandth of a liter | Synonyms: cc, cubic centimeter, cubic centimetre, milliliter, millilitre, ml |
| (noun) an angular unit used in artillery; equal to 1/6400 of a complete revolution | - |
| (noun) a Cypriot monetary unit equal to one thousandth of a pound | - |
| (noun) a Swedish unit of length equivalent to 10 km | Synonyms: mile, Swedish mile |
| milage | (noun) distance measured in miles | Synonyms: mileage |
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| milch | (adjective) giving milk; bred or suitable primarily for milk production | - |
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| milcher | (noun) cattle that are reared for their milk | Synonyms: dairy cattle, dairy cow, milch cow, milk cow, milker |
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| mild | (adjective) moderate in type or degree or effect or force; far from extreme | - |
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| (adjective) mild and pleasant | Synonyms: balmy, soft |
| (adjective) humble in spirit or manner; suggesting retiring mildness or even cowed submissiveness | Synonyms: meek, modest |
| mildew | (noun) a fungus that produces a superficial (usually white) growth on organic matter | - |
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| (noun) the process of becoming mildewed | Synonyms: mold, mould |
| (verb) become moldy; spoil due to humidity | Synonyms: mold, mould |
| mildly | (adverb) to a moderate degree | - |
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| (adverb) in a gentle manner | Synonyms: gently |
| mildness | (noun) mercifulness as a consequence of being lenient or tolerant | Synonyms: lenience, leniency, lenity |
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| (noun) acting in a manner that is gentle and mild and even-tempered | Synonyms: gentleness, softness |
| (noun) good weather with comfortable temperatures | Synonyms: clemency |
| mile | (noun) a footrace extending one mile | - |
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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, mi, stat mi, statute mile |
| (noun) a Swedish unit of length equivalent to 10 km | Synonyms: mil, Swedish mile |
| (noun) an ancient Roman unit of length equivalent to 1620 yards | Synonyms: Roman 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, mi, naut mi, nautical mile |
| (noun) a former British unit of length once used in navigation; equivalent to 6,000 feet (1828.8 meters) | Synonyms: sea 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, mi, naut mi, nautical mile |
| (noun) a large distance | - |
| mileage | (noun) distance measured in miles | Synonyms: milage |
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| (noun) a travel allowance at a given rate per mile traveled | - |
| (noun) the ratio of the number of miles traveled to the number of gallons of gasoline burned | Synonyms: fuel consumption rate, gas mileage, gasoline mileage |
| mileometer | (noun) a meter that shows mileage traversed | Synonyms: hodometer, milometer, odometer |
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| milepost | (noun) stone post at side of a road to show distances | Synonyms: milestone |
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| miler | (noun) a runner in a one-mile race | - |
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| (noun) (used only in combinations) the length of something in miles | - |
| milestone | (noun) stone post at side of a road to show distances | Synonyms: milepost |
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| (noun) a significant event in your life (or in a project) | - |
| milfoil | (noun) ubiquitous strong-scented mat-forming Eurasian herb of wasteland, hedgerow or pasture having narrow serrate leaves and small usually white florets; widely naturalized in North America | Synonyms: Achillea millefolium, yarrow |
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| miliaria | (noun) obstruction of the sweat ducts during high heat and humidity | Synonyms: heat rash, prickly heat |
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| milieu | (noun) the environmental condition | Synonyms: surroundings |
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| militainment | (noun) entertainment with military themes in which the Department of Defense is celebrated | - |
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| militance | (noun) a militant aggressiveness | Synonyms: combativeness, militancy |
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| militancy | (noun) a militant aggressiveness | Synonyms: combativeness, militance |
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| militant | (adjective) showing a fighting disposition | Synonyms: competitive |
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| (adjective) disposed to warfare or hard-line policies | Synonyms: hawkish, warlike |
| (adjective) engaged in war | Synonyms: belligerent, war-ridden, warring |
| (noun) a militant reformer | Synonyms: activist |