| 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 | - |
| millimicron | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, nanometer, nanometre, nm |
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| myonecrosis | (noun) localized death of muscle cell fibers | - |
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| necrobiosis | (noun) (physiology) the normal degeneration and death of living cells (as in various epithelial cells) | Synonyms: cell death |
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| necrolatry | (noun) superstitious worship or veneration of the dead. | - |
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| necrology | (noun) a notice of someone's death; usually includes a short biography | Synonyms: obit, obituary |
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| (noun) a list of people who died recently | - |
| necrolysis | (noun) disintegration and dissolution of dead tissue | - |
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| necromancer | (noun) one who practices magic or sorcery | Synonyms: magician, sorcerer, thaumaturge, thaumaturgist, wizard |
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| (noun) one who practices divination by conjuring up the dead | - |
| necromancy | (noun) conjuring up the dead, especially for prophesying | - |
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| (noun) the belief in magical spells that harness occult forces or evil spirits to produce unnatural effects in the world | Synonyms: black art, black magic, sorcery |
| necromania | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necrophilia, necrophilism |
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| necrophagia | (noun) feeding on corpses or carrion | Synonyms: necrophagy |
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| necrophagy | (noun) feeding on corpses or carrion | Synonyms: necrophagia |
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| necrophilia | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necromania, necrophilism |
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| necrophilism | (noun) an irresistible sexual attraction to dead bodies | Synonyms: necromania, necrophilia |
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| necropolis | (noun) a tract of land used for burials | Synonyms: burial ground, burial site, burying ground, cemetery, graveyard, memorial park |
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| necropsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: autopsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| necrosis | (noun) the localized death of living cells (as from infection or the interruption of blood supply) | Synonyms: gangrene, mortification, sphacelus |
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| omicron | (noun) the 15th letter of the Greek alphabet | - |
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| outcrop | (noun) the part of a rock formation that appears above the surface of the surrounding land | Synonyms: outcropping, rock outcrop |
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| outcropping | (noun) the part of a rock formation that appears above the surface of the surrounding land | Synonyms: outcrop, rock outcrop |
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| overcrossing | (noun) a bridge designed for pedestrians | Synonyms: footbridge, pedestrian bridge |
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| phalacrosis | (noun) the condition of having no hair on the top of the head | Synonyms: baldness |
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| photomicrograph | (noun) a photograph taken with the help of a microscope | - |
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| radiomicrometer | (noun) radiometer that is extremely sensitive | - |
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| scarecrow | (noun) an effigy in the shape of a man to frighten birds away from seeds | Synonyms: bird-scarer, scarer, straw man, strawman |
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| scrod | (noun) young Atlantic cod or haddock especially one split and boned for cooking | Synonyms: schrod |
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| (noun) flesh of young Atlantic cod weighing up to 2 pounds; also young haddock and pollock; often broiled | Synonyms: schrod |
| scrofula | (noun) a form of tuberculosis characterized by swellings of the lymphatic glands | Synonyms: king's evil, struma |
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| scroll | (noun) a document that can be rolled up (as for storage) | Synonyms: roll |
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| (noun) a round shape formed by a series of concentric circles (as formed by leaves or flower petals) | Synonyms: coil, curl, curlicue, gyre, ringlet, roll, whorl |
| scrooge | (noun) a selfish person who is unwilling to give or spend | Synonyms: churl, niggard, skinflint |
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| scrotum | (noun) the external pouch that contains the testes | - |
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| scrounger | (noun) someone who mooches or cadges (tries to get something free) | Synonyms: cadger, mooch, moocher |
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| sharecropper | (noun) small farmers and tenants | Synonyms: cropper, sharecrop farmer |
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| stonecrop | (noun) any of various northern temperate plants of the genus Sedum having fleshy leaves and red or yellow or white flowers | - |
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| sucrose | (noun) a complex carbohydrate found in many plants and used as a sweetening agent | Synonyms: saccharose |
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| testcross | (noun) a cross between an organism whose genotype for a certain trait is unknown and an organism that is homozygous recessive for that trait so the unknown genotype can be determined from that of the offspring | Synonyms: test-cross |
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| ultramicroscope | (noun) light microscope that uses scattered light to show particles too small to see with ordinary microscopes | Synonyms: dark-field microscope |
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