| mansard | (noun) a hip roof having two slopes on each side | Synonyms: mansard roof |
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| mantid | (noun) predacious long-bodied large-eyed insect of warm regions; rests with forelimbs raised as in prayer | Synonyms: mantis |
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| mantispid | (noun) insect that resembles a mantis; larvae are parasites in the nests of spiders and wasps | - |
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| maraud | (noun) a sudden short attack | Synonyms: foray, raid |
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| marblewood | (noun) large Asiatic tree having hard marbled zebrawood | Synonyms: Andaman marble, Diospyros kurzii, marble-wood |
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| (noun) hard marbled wood | Synonyms: marble-wood |
| marchland | (noun) district consisting of the area on either side of a border or boundary of a country or an area | Synonyms: border district, borderland, march |
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| marigold | (noun) any of various tropical American plants of the genus Tagetes widely cultivated for their showy yellow or orange flowers | - |
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| markweed | (noun) climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact | Synonyms: poison ivy, poison mercury, poison oak, Rhus radicans, Toxicodendron radicans |
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| married | (noun) a person who is married | - |
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| marshland | (noun) low-lying wet land with grassy vegetation; usually is a transition zone between land and water | Synonyms: fen, fenland, marsh |
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| masjid | (noun) (Islam) a Muslim place of worship | Synonyms: musjid |
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| mastermind | (noun) someone who creates new things | Synonyms: conceiver, originator |
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| (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, brainiac, Einstein, genius |
| masthead | (noun) the head or top of a mast | - |
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| (noun) the title of a newspaper or magazine; usually printed on the front page and on the editorial page | - |
| (noun) a listing printed in all issues of a newspaper or magazine (usually on the editorial page) that gives the name of the publication and the names of the editorial staff, etc. | Synonyms: flag |
| mastoid | (noun) process of the temporal bone behind the ear at the base of the skull | Synonyms: mastoid bone, mastoid process, mastoidal |
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| matchboard | (noun) a board that has a groove cut into one edge and a tongue cut into the other so they fit tightly together (as in a floor) | - |
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| matchweed | (noun) any of several plants of the genus Gutierrezia having tiny flower heads that resemble the heads of matches | Synonyms: matchbush |
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| matchwood | (noun) fragments of wood | - |
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| (noun) wood suitable for making matchsticks | - |
| (noun) wood in small pieces or splinters | Synonyms: splinters |
| maund | (noun) a unit of weight used in Asia; has different values in different countries | - |
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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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| mayweed | (noun) widespread rank-smelling weed having white-rayed flower heads with yellow discs | Synonyms: Anthemis cotula, dog fennel, stinking chamomile, stinking mayweed |
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| mazzard | (noun) wild or seedling sweet cherry used as stock for grafting | Synonyms: gean, mazzard cherry |
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| mead | (noun) made of fermented honey and water | - |
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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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| megatheriid | (noun) a large extinct ground sloth | Synonyms: megatherian, megatherian mammal |
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| meld | (noun) a form of rummy using two decks of cards and four jokers; jokers and deuces are wild; the object is to form groups of the same rank | Synonyms: basket rummy, canasta |
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| meloid | (noun) beetle that produces a secretion that blisters the skin | Synonyms: blister beetle |
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| mend | (noun) the act of putting something in working order again | Synonyms: fix, fixing, fixture, mending, repair, reparation |
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| (noun) sewing that repairs a worn or torn hole (especially in a garment) | Synonyms: darn, patch |
| mermaid | (noun) half woman and half fish; lives in the sea | - |
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| metalhead | (noun) a fan of heavy metal music | - |
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| meteoroid | (noun) (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere | Synonyms: meteor |
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| method | (noun) an acting technique introduced by Stanislavsky in which the actor recalls emotions or reactions from his or her own life and uses them to identify with the character being portrayed | Synonyms: method acting |
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| (noun) a way of doing something, especially a systematic way; implies an orderly logical arrangement (usually in steps) | - |
| microfarad | (noun) a unit of capacitance equal to one millionth of a farad | - |
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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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| microsecond | (noun) one millionth (10^-6) of a second; one thousandth of a millisecond | - |
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| midfield | (noun) (sports) the middle part of a playing field (as in football or lacrosse) | - |
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| midland | (noun) the interior part of a country | - |
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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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| milkmaid | (noun) a woman who works in a dairy | Synonyms: dairymaid |
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| milkweed | (noun) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts | Synonyms: silkweed |
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| (noun) annual Eurasian sow thistle with soft spiny leaves and rayed yellow flower heads | Synonyms: Sonchus oleraceus |
| millboard | (noun) stout pasteboard used to bind books | - |
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| milliard | (noun) a billion | - |
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| millifarad | (noun) a unit of capacitance equal to one thousandth of a farad | - |
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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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| millisecond | (noun) one thousandth (10^-3) of a second | Synonyms: msec |
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| millpond | (noun) a pond formed by damming a stream to provide a head of water to turn a mill wheel | - |
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| milord | (noun) a term of address for an English lord | - |
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| mind | (noun) that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason | Synonyms: brain, head, nous, psyche |
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| (noun) recall or remembrance | - |
| (noun) attention | - |
| (noun) an opinion formed by judging something | Synonyms: judgement, judgment |
| (noun) knowledge and intellectual ability | Synonyms: intellect |
| (noun) your intention; what you intend to do | Synonyms: idea |
| (noun) an important intellectual | Synonyms: creative thinker, thinker |
| minefield | (noun) a region in which explosives mines have been placed | - |
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| mineralocorticoid | (noun) hormone that is one of the steroids of the adrenal cortex that influences the metabolism of sodium and potassium | - |
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| minuend | (noun) the number from which the subtrahend is subtracted | - |
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| mirid | (noun) a variety of leaf bug | Synonyms: capsid, mirid bug |
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| misdeed | (noun) improper or wicked or immoral behavior | Synonyms: misbehavior, misbehaviour |
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| mockingbird | (noun) long-tailed grey-and-white songbird of the southern United States able to mimic songs of other birds | Synonyms: Mimus polyglotktos, mocker |
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| mod | (noun) a British teenager or young adult in the 1960s; noted for their clothes consciousness and opposition to the rockers | - |
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| mold | (noun) container into which liquid is poured to create a given shape when it hardens | Synonyms: cast, mould |
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| (noun) sculpture produced by molding | Synonyms: clay sculpture, modeling, modelling, molding, mould, moulding |
| (noun) a distinctive nature, character, or type | Synonyms: mould |
| (noun) a dish or dessert that is formed in or on a mold | Synonyms: mould |
| (noun) a fungus that produces a superficial growth on various kinds of damp or decaying organic matter | Synonyms: mould |
| (noun) the process of becoming mildewed | Synonyms: mildew, mould |
| (noun) the distinctive form in which a thing is made | Synonyms: cast, mould, stamp |
| (noun) loose soil rich in organic matter | Synonyms: mould |
| moldboard | (noun) wedge formed by the curved part of a steel plow blade that turns the furrow | Synonyms: mouldboard |
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| monad | (noun) (biology) a single-celled microorganism (especially a flagellate protozoan) | - |
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| (noun) a singular metaphysical entity from which material properties are said to derive | Synonyms: monas |
| (noun) (chemistry) an atom having a valence of one | - |
| mongoloid | (noun) a person suffering from Down syndrome (no longer used technically in this sense, now considered offensive) | - |
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| monkeypod | (noun) large ornamental tropical American tree with bipinnate leaves and globose clusters of flowers with crimson stamens and seed pods that are eaten by cattle | Synonyms: Albizia saman, monkey pod, rain tree, saman, zaman, zamang |
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| monkhood | (noun) monks collectively, considered as a group. | - |
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| monkshood | (noun) a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite | Synonyms: Aconitum napellus, helmet flower, helmetflower |
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| monohybrid | (noun) a hybrid produced by crossing parents that are homozygous except for a single gene locus that has two alleles (as in Mendel's experiments with garden peas) | - |
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| mood | (noun) a characteristic (habitual or relatively temporary) state of feeling | Synonyms: humor, humour, temper |
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| (noun) verb inflections that express how the action or state is conceived by the speaker | Synonyms: modality, mode |
| (noun) the prevailing psychological state | Synonyms: climate |
| moonseed | (noun) plant of the family Menispermaceae having red or black fruit with crescent- or ring-shaped seeds | - |
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| moorbird | (noun) reddish-brown grouse of upland moors of Great Britain | Synonyms: Lagopus scoticus, moor-bird, moorfowl, moorgame, red grouse |
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| moorland | (noun) open land usually with peaty soil covered with heather and bracken and moss | Synonyms: moor |
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| moosewood | (noun) deciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowers | Synonyms: Dirca palustris, leatherwood, moose-wood, ropebark, wicopy |
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| (noun) maple of eastern North America with striped bark and large two-lobed leaves clear yellow in autumn | Synonyms: Acer pennsylvanicum, goosefoot maple, moose-wood, striped dogwood, striped maple |
| mopboard | (noun) a molding covering the joint formed by a wall and the floor | Synonyms: baseboard, skirting board |
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| moped | (noun) a motorbike that can be pedaled or driven by a low-powered gasoline engine | - |
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| mortarboard | (noun) an academic cap with a flat square with a tassel on top | - |
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| (noun) a square board with a handle underneath; used by masons to hold or carry mortar | Synonyms: hawk |
| motherhood | (noun) the kinship relation between an offspring and the mother | Synonyms: maternity |
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| motherland | (noun) the country where you were born | Synonyms: country of origin, fatherland, homeland, mother country, native land |
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| mould | (noun) container into which liquid is poured to create a given shape when it hardens | Synonyms: cast, mold |
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| (noun) sculpture produced by molding | Synonyms: clay sculpture, modeling, modelling, mold, molding, moulding |
| (noun) a distinctive nature, character, or type | Synonyms: mold |
| (noun) a dish or dessert that is formed in or on a mold | Synonyms: mold |
| (noun) a fungus that produces a superficial growth on various kinds of damp or decaying organic matter | Synonyms: mold |
| (noun) the process of becoming mildewed | Synonyms: mildew, mold |
| (noun) the distinctive form in which a thing is made | Synonyms: cast, mold, stamp |
| (noun) loose soil rich in organic matter | Synonyms: mold |
| mouldboard | (noun) wedge formed by the curved part of a steel plow blade that turns the furrow | Synonyms: moldboard |
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| mound | (noun) the position on a baseball team of the player who throws the ball for a batter to try to hit | Synonyms: pitcher |
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| (noun) structure consisting of an artificial heap or bank usually of earth or stones | Synonyms: hill |
| (noun) (baseball) the slight elevation on which the pitcher stands | Synonyms: hill, pitcher's mound |
| (noun) a collection of objects laid on top of each other | Synonyms: agglomerate, cumulation, cumulus, heap, pile |
| (noun) a small natural hill | Synonyms: hammock, hillock, hummock, knoll |
| mousepad | (noun) a small portable pad that provides traction for the ball of a computer mouse | Synonyms: mouse mat |
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| mucoid | (noun) any of several glycoproteins similar to mucin | - |
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| mud | (noun) slanderous remarks or charges | - |
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| (noun) water soaked soil; soft wet earth | Synonyms: clay |
| mudguard | (noun) a curved piece above the wheel of a bicycle or motorcycle to protect the rider from water or mud thrown up by the wheels | Synonyms: splash-guard, splash guard |
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| muishond | (noun) southern African weasel | - |
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| mujahid | (noun) a Muslim engaged in what he considers to be a jihad | - |
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| mujtihad | (noun) an Islamic scholar who engages in ijtihad, the effort to derive rules of divine law from Muslim sacred texts | - |
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| multiplicand | (noun) the number that is multiplied by the multiplier | - |
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| musjid | (noun) (Islam) a Muslim place of worship | Synonyms: masjid |
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| muskwood | (noun) musk-scented shrub or tree of southern and southeastern Australia having creamy-yellow flower heads | Synonyms: Olearia argophylla |
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| musnud | (noun) a seat with a cushion that is used as a throne by Indian princes | - |
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| mustard | (noun) pungent powder or paste prepared from ground mustard seeds | Synonyms: table mustard |
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| (noun) leaves eaten as cooked greens | Synonyms: Indian mustard, leaf mustard, mustard greens |
| (noun) any of several cruciferous plants of the genus Brassica | - |
| mustelid | (noun) fissiped fur-bearing carnivorous mammals | Synonyms: musteline, musteline mammal |
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| muttonhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, numskull, shithead |
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| mylodontid | (noun) a variety of extinct edentate | - |
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| myriad | (noun) the cardinal number that is the product of ten and one thousand | Synonyms: 10000, ten thousand |
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| (noun) a large indefinite number | - |
| myriapod | (noun) general term for any terrestrial arthropod having an elongated body composed of many similar segments: e.g. centipedes and millipedes | - |
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| mytilid | (noun) marine bivalve mollusk having a dark elongated shell; live attached to solid objects especially in intertidal zones | Synonyms: marine mussel |
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| naiad | (noun) (Greek mythology) a nymph of lakes and springs and rivers and fountains | - |
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| (noun) submerged aquatic plant having narrow leaves and small flowers; of fresh or brackish water | Synonyms: water nymph |
| nailhead | (noun) flattened boss on the end of nail opposite to the point | - |
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| (noun) something resembling the head of a nail that is used as an ornamental device | - |
| nailrod | (noun) tall marsh plant with cylindrical seed heads that explode when mature shedding large quantities of down; its long flat leaves are used for making mats and chair seats; of North America, Europe, Asia and North Africa | Synonyms: bullrush, bulrush, cat's-tail, reed mace, reedmace, Typha latifolia |
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| nakedwood | (noun) tree of extreme southern Florida and West Indies having thin scaly bark and aromatic fruits and seeds and yielding hard heavy close-grained zebrawood | Synonyms: Eugenia dicrana |
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| (noun) any of several small to medium-sized trees of Florida and West Indies with thin scaly bark and heavy dark heartwood | - |
| nammad | (noun) an embroidered rug made from a coarse Indian felt | Synonyms: numdah, numdah rug |
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| nanosecond | (noun) one billionth (10^-9) of a second; one thousandth of a microsecond | - |
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