| mermaid | (noun) half woman and half fish; lives in the sea | - |
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| merman | (noun) half man and half fish; lives in the sea | - |
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| merobenthos | (noun) benthos consisting of organisms in pre-adult stages that later become adult in the plankton. | - |
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| meromelia | (noun) congenital absence of part of an arm or leg | - |
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| meronym | (noun) a word that names a part of a larger whole | Synonyms: part name |
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| meronymy | (noun) the semantic relation that holds between a part and the whole | Synonyms: part to whole relation |
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| merozoite | (noun) a cell that arises from the asexual division of a parent sporozoan during its life cycle | - |
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| merriment | (noun) activities that are enjoyable or amusing | Synonyms: fun, playfulness |
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| (noun) a gay feeling | Synonyms: gaiety |
| merriness | (noun) the trait of merry joking | Synonyms: humorousness, jocoseness, jocosity |
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| merrymaker | (noun) a celebrant who shares in a noisy party | Synonyms: reveler, reveller |
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| merrymaking | (noun) a boisterous celebration; a merry festivity | Synonyms: conviviality, jollification |
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| mesa | (noun) flat tableland with steep edges | Synonyms: table |
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| mesalliance | (noun) a marriage with a person of inferior social status | - |
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| mescal | (noun) a colorless Mexican liquor distilled from fermented juices of certain desert plants of the genus Agavaceae (especially the century plant) | - |
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| (noun) a small spineless globe-shaped cactus; source of mescal buttons | Synonyms: Lophophora williamsii, mezcal, peyote |
| mescaline | (noun) the hallucinatory alkaloid that is the active agent in mescal buttons | Synonyms: peyote |
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| mesencephalon | (noun) the middle portion of the brain | Synonyms: midbrain |
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| mesenchyme | (noun) mesodermal tissue that forms connective tissue and blood and smooth muscles | - |
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| mesentery | (noun) a double layer of peritoneum that attaches to the back wall of the abdominal cavity and supports the small intestines | - |
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| mesh | (noun) the act of interlocking or meshing | Synonyms: interlock, interlocking, meshing |
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| (noun) an open fabric of string or rope or wire woven together at regular intervals | Synonyms: meshing, meshwork, net, network |
| (noun) the topology of a network whose components are all connected directly to every other component | Synonyms: mesh topology |
| (noun) contact by fitting together | Synonyms: engagement, interlocking, meshing |
| (noun) the number of openings per linear inch of a screen; measures size of particles | - |
| meshing | (noun) the act of interlocking or meshing | Synonyms: interlock, interlocking, mesh |
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| (noun) an open fabric of string or rope or wire woven together at regular intervals | Synonyms: mesh, meshwork, net, network |
| (noun) contact by fitting together | Synonyms: engagement, interlocking, mesh |
| meshugaas | (noun) (Yiddish) craziness; senseless behavior or activity | Synonyms: mishegaas, mishegoss |
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| meshuggeneh | (noun) (Yiddish) a crazy fool | Synonyms: meshuggener |
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| meshuggener | (noun) (Yiddish) a crazy fool | Synonyms: meshuggeneh |
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| meshwork | (noun) an open fabric of string or rope or wire woven together at regular intervals | Synonyms: mesh, meshing, net, network |
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| mesmerism | (noun) the act of inducing hypnosis | Synonyms: hypnotism, suggestion |
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| mesmerist | (noun) a person who induces hypnosis | Synonyms: hypnotiser, hypnotist, hypnotizer, mesmerizer |
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| mesmerizer | (noun) a person who induces hypnosis | Synonyms: hypnotiser, hypnotist, hypnotizer, mesmerist |
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| mesoblast | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoderm |
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| mesocarp | (noun) the middle layer of a pericarp | - |
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| mesocolon | (noun) mesentery that holds the lower colon to the dorsal abdominal wall | - |
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| mesoderm | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoblast |
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| mesohippus | (noun) North American three-toed Oligocene animal; probably not directly ancestral to modern horses | - |
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| mesomorph | (noun) a person with a well-developed muscular body | - |
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| mesomorphy | (noun) muscular and big-boned | Synonyms: athletic type |
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| meson | (noun) an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | Synonyms: mesotron |
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| mesophyron | (noun) a smooth prominence of the frontal bone between and above the eyebrows; the most forward projecting point of the forehead in the midline at the level of the supraorbital ridges | Synonyms: glabella |
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| mesophyte | (noun) land plant growing in surroundings having an average supply of water; compare xerophyte and hydrophyte | Synonyms: mesophytic plant |
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| mesosphere | (noun) the atmospheric layer between the stratosphere and the thermosphere | - |
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| mesothelioma | (noun) a form of carcinoma of the mesothelium lining lungs or abdomen or heart; usually associated with exposure to asbestos dust | - |
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| mesothelium | (noun) epithelium originating in the embryonic mesoderm; lines the primordial body cavity | - |
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| mesotron | (noun) an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | Synonyms: meson |
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| mesquit | (noun) any of several small spiny trees or shrubs of the genus Prosopis having small flowers in axillary cylindrical spikes followed by large pods rich in sugar | Synonyms: mesquite |
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| mesquite | (noun) any of several small spiny trees or shrubs of the genus Prosopis having small flowers in axillary cylindrical spikes followed by large pods rich in sugar | Synonyms: mesquit |
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| mess | (noun) a (large) military dining room where service personnel eat or relax | Synonyms: mess hall |
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| (noun) a meal eaten in a mess hall by service personnel | - |
| (noun) soft semiliquid food | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| (noun) a state of confusion and disorderliness | Synonyms: messiness, muss, mussiness |
| (noun) informal terms for a difficult situation | Synonyms: fix, hole, jam, kettle of fish, muddle, pickle |
| message | (noun) content communicating a message; what something is about | Synonyms: content, subject matter, substance |
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| (noun) a communication (usually brief) that is written or spoken or signaled | - |
| messaging | (noun) the sending and processing of e-mail by computer | Synonyms: electronic messaging |
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| messenger | (noun) a person who carries a message | Synonyms: courier |
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| messiah | (noun) any expected deliverer | Synonyms: christ |
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| messiahship | (noun) the position of messiah | - |
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| messiness | (noun) the trait of being untidy and messy | Synonyms: untidiness |
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| (noun) a state of confusion and disorderliness | Synonyms: mess, muss, mussiness |
| messmate | (noun) (nautical) an associate with whom you share meals in the same mess (as on a ship) | - |
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| messuage | (noun) (law) a dwelling house and its adjacent buildings and the adjacent land used by the household | - |
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| mestiza | (noun) a woman of mixed racial ancestry (especially mixed European and Native American ancestry) | - |
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| mestizo | (noun) a person of mixed racial ancestry (especially mixed European and Native American ancestry) | - |
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| mestranol | (noun) a synthetic form of estrogen used in combination with a progestin in oral contraceptives | - |
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| metabola | (noun) insects that undergo complete metamorphosis | Synonyms: holometabola |
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| metabolism | (noun) the organic processes (in a cell or organism) that are necessary for life | Synonyms: metabolic process |
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| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metamorphosis |
| metabolite | (noun) any substance involved in metabolism (either as a product of metabolism or as necessary for metabolism) | - |
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| metacarpal | (noun) any bone of the hand between the wrist and fingers | Synonyms: metacarpal bone |
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| metacarpus | (noun) the part of the hand between the carpus and phalanges | - |
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| metacenter | (noun) (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship | Synonyms: metacentre |
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| metacentre | (noun) (shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the distance of this intersection above the center of gravity is an indication of the stability of the ship | Synonyms: metacenter |
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| metacyesis | (noun) pregnancy resulting from gestation elsewhere than in the uterus | Synonyms: eccyesis, ectopic gestation, ectopic pregnancy, extrauterine gestation, extrauterine pregnancy |
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| metadata | (noun) data about data | - |
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| metagenesis | (noun) alternation of sexual and asexual generations | Synonyms: digenesis |
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| metaknowledge | (noun) knowledge about knowledge | - |
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| metal | (noun) any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. | Synonyms: metallic element |
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| (noun) a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten | Synonyms: alloy |
| metalanguage | (noun) a language that can be used to describe languages | - |
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| metalepsis | (noun) substituting metonymy of one figurative sense for another | - |
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| metalhead | (noun) a fan of heavy metal music | - |
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| metallic | (noun) a yarn made partly or entirely of metal | - |
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| (noun) a fabric made of a yarn that is partly or entirely of metal | - |
| metallicity | (noun) The state of possessing a similar aural resonance to metal. | - |
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| metallurgist | (noun) an engineer trained in the extraction and refining and alloying and fabrication of metals | Synonyms: metallurgical engineer |
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| metallurgy | (noun) the science and technology of metals | - |
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| metalware | (noun) household articles made of metal (especially for use at table) | - |
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| metalwork | (noun) the activity of making things out of metal in a skillful manner | Synonyms: metalworking |
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| (noun) the metal parts of something | - |
| metalworker | (noun) someone who works metal (especially by hammering it when it is hot and malleable) | Synonyms: smith |
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| metalworking | (noun) the activity of making things out of metal in a skillful manner | Synonyms: metalwork |
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| metalworks | (noun) factory where metal castings are produced | Synonyms: foundry |
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| metamathematics | (noun) the logical analysis of mathematical reasoning | - |
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| metamere | (noun) one of a series of similar body segments into which some animals are divided longitudinally | Synonyms: somite |
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| metamorphism | (noun) change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances | - |
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| metamorphopsia | (noun) a defect of vision in which objects appear to be distorted; usually due to a defect in the retina | - |
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| metamorphosis | (noun) a complete change of physical form or substance especially as by magic or witchcraft | - |
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| (noun) a striking change in appearance or character or circumstances | Synonyms: transfiguration |
| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metabolism |
| metaphase | (noun) the second stage of mitosis | - |
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| (noun) the second stage of meiosis | - |
| metaphor | (noun) a figure of speech in which an expression is used to refer to something that it does not literally denote in order to suggest a similarity | - |
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| metaphysics | (noun) the philosophical study of being and knowing | - |
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| metaphysis | (noun) the growing part of a long bone between the diaphysis and the epiphysis | - |
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| metaproterenol | (noun) a bronchodilator (trade name Alupent) used to treat asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects include tachycardia and shakiness | Synonyms: Alupent |
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| metarule | (noun) a rule that describes how other rules should be used (as in AI) | - |
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| metasequoia | (noun) large fast-growing Chinese monoecious tree having flat bright-green deciduous leaves and small globular cones; commonly cultivated in United States as an ornamental; known as a fossil before being discovered in China | Synonyms: dawn redwood, Metasequoia glyptostrodoides |
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| metastability | (noun) the quality of a physical system that persists in its existing equilibrium when undisturbed (or only slightly disturbed) but able to pass to a more stable equilibrium when sufficiently disturbed | - |
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| metastasis | (noun) the spreading of a disease (especially cancer) to another part of the body | - |
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| metatarsal | (noun) any bone of the foot between the ankle and the toes | - |
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| metatarsus | (noun) the skeleton of the human foot between the toes and the tarsus; the corresponding part of the foot in birds or of the hind foot in quadrupeds | - |
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| metatherian | (noun) primitive pouched mammals found mainly in Australia and the Americas | - |
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| metathesis | (noun) a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB) | Synonyms: double decomposition, double decomposition reaction |
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| (noun) a linguistic process of transposition of sounds or syllables within a word or words within a sentence | - |
| metazoan | (noun) any animal of the subkingdom Metazoa; all animals except protozoans and sponges | - |
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| mete | (noun) a line that indicates a boundary | Synonyms: border, borderline, boundary line, delimitation |
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| metempsychosis | (noun) after death the soul begins a new cycle of existence in another human body | Synonyms: rebirth |
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