| isopropanol | (noun) alcohol used as antifreeze or a solvent | Synonyms: isopropyl alcohol |
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| isoproterenol | (noun) drug (trade name Isuprel) used to treat bronchial asthma and to stimulate the heart | Synonyms: Isuprel |
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| isoseismal | (noun) a line on a map connecting points at which earthquake shocks are of equal intensity. | - |
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| isosorbide | (noun) drug (trade name Isordil) used to treat angina pectoris and congestive heart failure | Synonyms: Isordil |
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| isostasy | (noun) (geology) a general equilibrium of the forces tending to elevate or depress the earth's crust | - |
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| isosyllabism | (noun) (linguistics, poetry) the use of isosyllabic verse. | - |
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| isotach | (noun) a line joining points with constant wind speed. | - |
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| isothere | (noun) a line on a map linking places with the same mean summer temperature. | - |
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| isotherm | (noun) (meteorology) an isogram connecting points having the same temperature at a given time | - |
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| isothiocyanate | (noun) a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations | - |
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| isotope | (noun) one of two or more atoms with the same atomic number but with different numbers of neutrons | - |
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| isotropy | (noun) (physics) the property of being isotropic; having the same value when measured in different directions | Synonyms: symmetry |
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| jimsonweed | (noun) intensely poisonous tall coarse annual tropical weed having rank-smelling foliage, large white or violet trumpet-shaped flowers and prickly fruits | Synonyms: apple of Peru, common thorn apple, Datura stramonium, Jamestown weed, jimson weed |
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| keelson | (noun) a longitudinal beam connected to the keel of ship to strengthen it | - |
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| kicksorter | (noun) scientific instrument consisting of an electronic circuit that permits only voltage pulses of predetermined height to pass | Synonyms: pulse height analyzer |
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| kinsperson | (noun) a person having kinship with another or others | Synonyms: family, kin |
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| lansoprazole | (noun) antacid (trade name Prevacid) that suppresses acid secretion in the stomach | Synonyms: Prevacid |
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| lasso | (noun) a long noosed rope used to catch animals | Synonyms: lariat, reata, riata |
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| layperson | (noun) someone who is not a clergyman or a professional person | Synonyms: layman, secular |
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| lesson | (noun) a task assigned for individual study | - |
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| (noun) a unit of instruction | - |
| (noun) punishment intended as a warning to others | Synonyms: deterrent example, example, object lesson |
| (noun) the significance of a story or event | Synonyms: moral |
| lessor | (noun) someone who grants a lease | Synonyms: lease giver |
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| liaison | (noun) a channel for communication between groups | Synonyms: contact, inter-group communication, link |
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| (noun) a usually secretive or illicit sexual relationship | Synonyms: affair, affaire, amour, intimacy, involvement |
| lightsomeness | (noun) the trait of being lighthearted and frivolous | Synonyms: lightness |
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| (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: agility, legerity, lightness, nimbleness |
| (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, insouciance, lightheartedness |
| liposome | (noun) an artificially made microscopic vesicle into which nucleic acids can be packaged; used in molecular biology as a transducing vector | - |
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| lissomeness | (noun) the gracefulness of a person or animal that is flexible and supple | Synonyms: litheness, suppleness |
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| loathsomeness | (noun) the quality of being disgusting to the senses or emotions | Synonyms: lousiness, repulsiveness, sliminess, vileness, wickedness |
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| lonesomeness | (noun) a disposition toward being alone | Synonyms: aloneness, loneliness, solitariness |
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| lysogenicity | (noun) the condition of a host bacterium that has incorporated a phage into its own genetic material | Synonyms: lysogeny |
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| lysogenisation | (noun) the process by which a bacterium acquires a phage that becomes integrated into its genome | Synonyms: lysogenization |
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| lysogenization | (noun) the process by which a bacterium acquires a phage that becomes integrated into its genome | Synonyms: lysogenisation |
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| lysogeny | (noun) the condition of a host bacterium that has incorporated a phage into its own genetic material | Synonyms: lysogenicity |
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| lysosome | (noun) an organelle found in the cytoplasm of most cells (especially in leukocytes and liver and kidney cells) | - |
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| lysozyme | (noun) an enzyme found in saliva and sweat and tears that destroys the cell walls of certain bacteria | Synonyms: muramidase |
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| mafioso | (noun) a member of the Mafia crime syndicate in the United States | - |
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| (noun) a member of the Sicilian Mafia | - |
| mailsorter | (noun) a sorter for sorting mail according to the address | - |
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| maisonette | (noun) a small house | Synonyms: maisonnette |
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| (noun) a self-contained apartment (usually on two floors) in a larger house and with its own entrance from the outside | Synonyms: maisonnette |
| maisonnette | (noun) a small house | Synonyms: maisonette |
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| (noun) a self-contained apartment (usually on two floors) in a larger house and with its own entrance from the outside | Synonyms: maisonette |
| malabsorption | (noun) abnormal absorption of nutrients from the digestive tract | - |
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| masochism | (noun) sexual pleasure obtained from receiving punishment (physical or psychological) | - |
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| masochist | (noun) someone who obtains pleasure from receiving punishment | - |
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| mason | (noun) a craftsman who works with stone or brick | Synonyms: stonemason |
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| masonry | (noun) the craft of a mason | - |
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| (noun) structure built of stone or brick by a mason | - |
| mausoleum | (noun) a large burial chamber, usually above ground | - |
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| meddlesomeness | (noun) aggressiveness as evidenced by intruding; by advancing yourself or your ideas without invitation | Synonyms: intrusiveness, officiousness |
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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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| 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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| mettlesomeness | (noun) courageous high-spiritedness | - |
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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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| 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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| milksop | (noun) a timid man or boy considered childish or unassertive | Synonyms: Milquetoast, pansy, pantywaist, sissy |
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| mirasol | (noun) annual sunflower grown for silage and for its seeds which are a source of oil; common throughout United States and much of North America | Synonyms: common sunflower, Helianthus annuus |
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| miso | (noun) a thick paste made from fermented soybeans and barley or rice malt; used in Japanese cooking to make soups or sauces | - |
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| misocainea | (noun) hatred of new ideas | - |
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| misogamist | (noun) a person who hates marriage | - |
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| misogamy | (noun) hatred of marriage | - |
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| misogynism | (noun) hatred of women | Synonyms: misogyny |
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| misogynist | (noun) a misanthrope who dislikes women in particular | Synonyms: woman hater |
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| misogyny | (noun) hatred of women | Synonyms: misogynism |
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| misology | (noun) hatred of reasoning | - |
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| misoneism | (noun) hatred of change or innovation | - |
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| misopedia | (noun) hatred of children | - |
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| monopsony | (noun) (economics) a market in which goods or services are offered by several sellers but there is only one buyer | - |
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| monosomy | (noun) chromosomal abnormality consisting of the absence of one chromosome from the normal diploid number | - |
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| monsoon | (noun) a seasonal wind in southern Asia; blows from the southwest (bringing rain) in summer and from the northeast in winter | - |
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| (noun) any wind that changes direction with the seasons | - |
| (noun) rainy season in southern Asia when the southwestern monsoon blows, bringing heavy rains | - |
| morosoph | (noun) a learned fool | - |
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| multiprocessor | (noun) a computer that uses two or more processing units under integrated control | - |
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| musophobia | (noun) a morbid fear of mice | - |
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| mysoandry | (noun) hatred for men or boys | - |
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| mysophilia | (noun) abnormal attraction to filth | - |
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| mysophobia | (noun) a morbid fear of dirt or contamination | - |
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| nainsook | (noun) a soft lightweight muslin used especially for babies | - |
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| nasopharynx | (noun) cavity forming the upper part of the pharynx | - |
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| nelson | (noun) any of several wrestling holds in which an arm is passed under the opponent's arm from behind and the hand exerts pressure on the back of the neck | - |
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| newsperson | (noun) a person who investigates and reports or edits news stories | Synonyms: reporter |
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| nitrosobacteria | (noun) soil bacteria that oxidize ammonia to nitrites | Synonyms: nitrous bacteria |
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| noisomeness | (noun) the quality of being noxious | Synonyms: harmfulness, noxiousness |
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| nonabsorbency | (noun) the property of not being absorbent | - |
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| nonperson | (noun) a person regarded as nonexistent and having no rights; a person whose existence is systematically ignored (especially for ideological or political reasons) | Synonyms: unperson |
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| nosology | (noun) the branch of medical science dealing with the classification of disease | Synonyms: diagnostics |
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| obsolescence | (noun) the process of becoming obsolete; falling into disuse or becoming out of date | - |
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| obsoleteness | (noun) the property of being out of date and not current | Synonyms: superannuation |
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| oesophagitis | (noun) inflammation of the esophagus; often caused by gastroesophageal reflux | Synonyms: esophagitis |
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| oesophagoscope | (noun) an optical instrument for examining the inside of the esophagus | Synonyms: esophagoscope |
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| oesophagus | (noun) the passage between the pharynx and the stomach | Synonyms: esophagus, gorge, gullet |
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| oppressor | (noun) a person of authority who subjects others to undue pressures | - |
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| opsonin | (noun) an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes | - |
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