| 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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| millimicron | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, nanometer, nanometre, nm |
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| mimic | (noun) someone who mimics (especially an actor or actress) | Synonyms: mimicker |
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| mimicker | (noun) someone who mimics (especially an actor or actress) | Synonyms: mimic |
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| mimicry | (noun) the act of mimicking; imitative behavior | Synonyms: apery |
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| (noun) the resemblance of an animal species to another species or to natural objects; provides concealment and protection from predators | - |
| morphophonemics | (noun) the study of the phonological realization of the allomorphs of the morphemes of a language | - |
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| mummichog | (noun) silver-and-black killifish of saltwater marshes along the Atlantic coast of the United States | Synonyms: Fundulus heteroclitus |
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| neurochemical | (noun) any organic substance that occurs in neural activity | - |
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| omicron | (noun) the 15th letter of the Greek alphabet | - |
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| panamica | (noun) low stingless nettle of Central and South America having velvety brownish-green toothed leaves and clusters of small green flowers | Synonyms: friendship plant, panamiga, Pilea involucrata |
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| pandemic | (noun) an epidemic that is geographically widespread; occurring throughout a region or even throughout the world | - |
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| patronymic | (noun) a family name derived from name of your father or a paternal ancestor (especially with an affix (such as -son in English or O'- in Irish) added to the name of your father or a paternal ancestor) | Synonyms: patronym |
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| pemican | (noun) lean dried meat pounded fine and mixed with melted fat; used especially by North American Indians | Synonyms: pemmican |
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| pemmican | (noun) lean dried meat pounded fine and mixed with melted fat; used especially by North American Indians | Synonyms: pemican |
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| petrochemical | (noun) any compound obtained from petroleum or natural gas | - |
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| phonemics | (noun) the study of the sound system of a given language and the analysis and classification of its phonemes | Synonyms: phonology |
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| photomicrograph | (noun) a photograph taken with the help of a microscope | - |
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| phytochemical | (noun) a chemical substance obtained from plants that is biologically active but not nutritive | - |
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| polemic | (noun) a controversy (especially over a belief or dogma) | - |
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| (noun) a writer who argues in opposition to others (especially in theology) | Synonyms: polemicist, polemist |
| polemicist | (noun) a writer who argues in opposition to others (especially in theology) | Synonyms: polemic, polemist |
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| polemics | (noun) the branch of Christian theology devoted to the refutation of errors | - |
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| proteomics | (noun) the branch of genetics that studies the full set of proteins encoded by a genome | - |
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| proxemics | (noun) the study of spatial distances between individuals in different cultures and situations | - |
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| psychodynamics | (noun) the branch of social psychology that deals with the processes and emotions that determine psychology and motivation | - |
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| (noun) the interrelation of conscious and unconscious processes and emotions that determine personality and motivation | - |
| psychonomics | (noun) the branch of psychology that uses experimental methods to study psychological issues | Synonyms: experimental psychology |
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| pumice | (noun) a light glass formed on the surface of some lavas; used as an abrasive | Synonyms: pumice stone |
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| radiomicrometer | (noun) radiometer that is extremely sensitive | - |
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| rhythmicity | (noun) the rhythmic property imparted by the accents and relative durations of notes in a piece of music | - |
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| semicentenary | (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentennial |
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| semicentennial | (noun) the 50th anniversary (or the celebration of it) | Synonyms: semicentenary |
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| semicircle | (noun) a plane figure with the shape of half a circle | Synonyms: hemicycle |
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| semicoke | (noun) Semicoke is a solid residue obtained by carbonization of coal at a relatively low temperature (below 700° C). | - |
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| semicolon | (noun) a punctuation mark (;) used to connect independent clauses; indicates a closer relation than does a period | - |
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| semicoma | (noun) a mild comatose state; a coma from which the person can be roused by appropriate stimuli | - |
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| semiconductor | (noun) a conductor made with semiconducting material | Synonyms: semiconductor device, semiconductor unit |
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| (noun) a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities | Synonyms: semiconducting material |
| semiconsciousness | (noun) marginal consciousness | Synonyms: grogginess, stupefaction, stupor |
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| spermicide | (noun) a contraceptive agent that kills spermatozoa | Synonyms: spermatocide |
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| thermodynamics | (noun) the branch of physics concerned with the conversion of different forms of energy | - |
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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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| vermicelli | (noun) pasta in strings thinner than spaghetti | - |
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| vermicide | (noun) an agent that kills worms (especially those in the intestines) | - |
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| vermiculation | (noun) a decoration consisting of wormlike carvings | - |
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| (noun) the process of wavelike muscle contractions of the alimentary tract that moves food along | Synonyms: peristalsis |
| vermiculite | (noun) any of a group of yellow or brown hydrous silicate minerals having a micaceous structure | - |
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