| jeroboam | (noun) a large wine bottle (holds 4/5 of a gallon) | Synonyms: double-magnum |
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| jetsam | (noun) the floating wreckage of a ship | Synonyms: flotsam |
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| (noun) the part of a ship's equipment or cargo that is thrown overboard to lighten the load in a storm | - |
| jibboom | (noun) a spar that extends the bowsprit | - |
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| jingoism | (noun) fanatical patriotism | Synonyms: chauvinism, superpatriotism, ultranationalism |
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| (noun) an appeal intended to arouse patriotic emotions | Synonyms: flag waving |
| jointworm | (noun) larva of chalcid flies injurious to the straw of wheat and other grains | Synonyms: strawworm |
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| jorum | (noun) a large drinking bowl | - |
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| (noun) the quantity that a jorum will hold. | - |
| journalism | (noun) the profession of reporting or photographing or editing news stories for one of the media | - |
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| (noun) newspapers and magazines collectively | Synonyms: news media |
| kabbalism | (noun) adherence to some extreme traditional theological concept or interpretation | Synonyms: cabalism |
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| karyoplasm | (noun) the protoplasm that constitutes the nucleus of a cell | Synonyms: nucleoplasm |
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| katabolism | (noun) breakdown in living organisms of more complex substances into simpler ones together with release of energy | Synonyms: catabolism, destructive metabolism, dissimilation |
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| katamorphism | (noun) metamorphism that occurs at or near the earth's surface; breaks down complex minerals into simpler ones | - |
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| kettledrum | (noun) a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it | Synonyms: kettle, timpani, tympani, tympanum |
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| keurboom | (noun) tree with odd-pinnate leaves and racemes of fragrant pink to purple flowers | Synonyms: Virgilia capensis, Virgilia oroboides |
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| (noun) fast-growing roundheaded tree with fragrant white to deep rose flowers; planted as an ornamental | Synonyms: Virgilia divaricata |
| khoum | (noun) 5 khoums equal 1 ouguiya in Mauritania | - |
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| kilogram | (noun) one thousand grams; the basic unit of mass adopted under the Systeme International d'Unites | Synonyms: kg, kilo |
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| kingdom | (noun) a basic group of natural objects | - |
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| (noun) a monarchy with a king or queen as head of state | - |
| (noun) the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia | - |
| (noun) the domain ruled by a king or queen | Synonyms: realm |
| (noun) a country with a king as head of state | - |
| (noun) a domain in which something is dominant | Synonyms: land, realm |
| km | (noun) a metric unit of length equal to 1000 meters (or 0.621371 miles) | Synonyms: kilometer, kilometre, klick |
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| labdanum | (noun) a soft blackish-brown resinous exudate from various rockroses used in perfumes especially as a fixative | Synonyms: ladanum |
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| (noun) a dark brown to greenish oleoresin that has a fragrant odor and is used as a fixative in perfumes; obtained as a juice from certain rockroses | Synonyms: gum labdanum |
| labium | (noun) a liplike structure that bounds a bodily orifice (especially any of the four labiate folds of a woman's vulva) | - |
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| laconicism | (noun) terseness of expression | Synonyms: laconism |
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| laconism | (noun) terseness of expression | Synonyms: laconicism |
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| ladanum | (noun) a soft blackish-brown resinous exudate from various rockroses used in perfumes especially as a fixative | Synonyms: labdanum |
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| lam | (noun) a rapid escape (as by criminals) | Synonyms: getaway |
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| lambdacism | (noun) speech defect involving excessive use or unusual pronunciation of the phoneme `l' | - |
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| lanthanum | (noun) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth | Synonyms: atomic number 57, La |
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| laryngospasm | (noun) a closure of the larynx that blocks the passage of air to the lungs | - |
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| latergram | (noun) a photo to be posted to Instagram at a later date | - |
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| laudanum | (noun) narcotic consisting of an alcohol solution of opium or any preparation in which opium is the main ingredient | Synonyms: tincture of opium |
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| lawrencium | (noun) a radioactive transuranic element synthesized from californium | Synonyms: atomic number 103, Lr |
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| lcm | (noun) the smallest multiple that is exactly divisible by every member of a set of numbers | Synonyms: least common multiple, lowest common multiple |
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| lebensraum | (noun) space sought for occupation by a nation whose population is expanding | Synonyms: living space |
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| leftism | (noun) the ideology of the political left; belief in or support of the tenets of the political left | - |
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| legalism | (noun) strict conformity to the letter of the law rather than its spirit | - |
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| leptosporangium | (noun) a sporangium formed from a single epidermal cell; characteristic of the Filicales or of almost all modern ferns | - |
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| lesbianism | (noun) female homosexuality | Synonyms: sapphism |
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| liberalism | (noun) a political orientation that favors social progress by reform and by changing laws rather than by revolution | - |
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| (noun) an economic theory advocating free competition and a self-regulating market | - |
| libertarianism | (noun) an ideological belief in freedom of thought, speech and action | - |
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| libertinism | (noun) A lifestyle or pattern of behavior characterized by self-indulgence and lack of restraint, especially one involving sexual promiscuity and rejection of religious or other moral authority. | - |
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| lignum | (noun) woody tissue | - |
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| lingam | (noun) the Hindu phallic symbol of Siva | - |
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| linoleum | (noun) a floor covering | Synonyms: lino |
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| lipogram | (noun) a text that excludes a particular letter or particular letters of the alphabet | - |
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| literalism | (noun) the doctrine of realistic (literal) portrayal in art or literature | - |
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| (noun) a disposition to interpret statements in their literal sense | - |
| lithium | (noun) a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals | Synonyms: atomic number 3, Li |
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| lm | (noun) a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions | Synonyms: lumen |
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| loam | (noun) a rich soil consisting of a mixture of sand and clay and decaying organic materials | - |
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| lobbyism | (noun) the practice of lobbying; the activities of a lobbyist | - |
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| lobworm | (noun) marine worms having a row of tufted gills along each side of the back; often used for fishing bait | Synonyms: lug, lugworm |
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| localism | (noun) a partiality for some particular place | Synonyms: provincialism, sectionalism |
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| (noun) a phrase or pronunciation that is peculiar to a particular locality | - |
| locoism | (noun) a disease of livestock caused by locoweed poisoning; characterized by weakness and lack of coordination and trembling and partial paralysis | Synonyms: loco disease |
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| locum | (noun) someone (physician or clergyman) who substitutes temporarily for another member of the same profession | Synonyms: locum tenens |
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| logarithm | (noun) the exponent required to produce a given number | Synonyms: log |
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| logicism | (noun) (philosophy) the philosophical theory that all of mathematics can be derived from formal logic | - |
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| logjam | (noun) an immovable mass of logs blocking a river | - |
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| (noun) any stoppage attributable to unusual activity | - |
| logogram | (noun) a single written symbol that represents an entire word or phrase without indicating its pronunciation | Synonyms: logograph |
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| loom | (noun) a textile machine for weaving yarn into a textile | - |
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| lorazepam | (noun) tranquilizer (trade name Ativan) used to treat anxiety and tension and insomnia | Synonyms: Ativan |
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| lugworm | (noun) marine worms having a row of tufted gills along each side of the back; often used for fishing bait | Synonyms: lobworm, lug |
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| luminism | (noun) an artistic movement in the United States that was derived from the Hudson River school; active from 1850 to 1870; painted realistic landscapes in a style that pictured atmospheric light and the use of aerial perspective | - |
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| lunchroom | (noun) a restaurant (in a facility) where lunch can be purchased | - |
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| lustrum | (noun) a ceremonial purification of the Roman population every five years following the census | - |
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| (noun) a period lasting five years | - |
| lutecium | (noun) a trivalent metallic element of the rare earth group; usually occurs in association with yttrium | Synonyms: atomic number 71, Lu, lutetium |
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| lutetium | (noun) a trivalent metallic element of the rare earth group; usually occurs in association with yttrium | Synonyms: atomic number 71, Lu, lutecium |
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| lyceum | (noun) a public hall for lectures and concerts | - |
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| (noun) a school for students intermediate between elementary school and college; usually grades 9 to 12 | Synonyms: Gymnasium, lycee, middle school, secondary school |
| lymphangiogram | (noun) an angiogram of the lymph nodes and lymph vessels made after the injection of a radiopaque substance | - |
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| lyricism | (noun) the property of being suitable for singing | Synonyms: lyricality, songfulness |
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| (noun) unrestrained and exaggerated enthusiasm | - |
| m | (noun) the 13th letter of the Roman alphabet | Synonyms: M |
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| (noun) the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards) | Synonyms: meter, metre |
| macadam | (noun) a paved surface having compressed layers of broken rocks held together with tar | Synonyms: tarmac, tarmacadam |
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| (noun) broken stone used in macadamized roadways | - |
| macrocosm | (noun) everything that exists anywhere | Synonyms: cosmos, creation, existence, universe, world |
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| macrosporangium | (noun) a plant structure that produces megaspores | Synonyms: megasporangium |
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| madam | (noun) a woman of refinement | Synonyms: dame, gentlewoman, lady, ma'am |
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| (noun) a woman who runs a house of prostitution | Synonyms: brothel keeper |
| maelstrom | (noun) a powerful circular current of water (usually the result of conflicting tides) | Synonyms: vortex, whirlpool |
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| magnesium | (noun) a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine) | Synonyms: atomic number 12, Mg |
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| magnetism | (noun) the branch of science that studies magnetism | Synonyms: magnetics |
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| (noun) attraction for iron; associated with electric currents as well as magnets; characterized by fields of force | Synonyms: magnetic attraction, magnetic force |
| magnum | (noun) a large wine bottle for liquor or wine | - |
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| maidism | (noun) a disease caused by deficiency of niacin or tryptophan (or by a defect in the metabolic conversion of tryptophan to niacin); characterized by gastrointestinal disturbances and erythema and nervous or mental disorders; may be caused by malnutrition or alcoholism or other nutritional impairments | Synonyms: Alpine scurvy, mal de la rosa, mal rosso, mayidism, pellagra, Saint Ignatius' itch |
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| mainstream | (noun) the prevailing current of thought | - |
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| malapropism | (noun) the unintentional misuse of a word by confusion with one that sounds similar | Synonyms: malaprop |
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| mammogram | (noun) X-ray film of the soft tissue of the breast | - |
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| mannerism | (noun) a deliberate pretense or exaggerated display | Synonyms: affectation, affectedness, pose |
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| (noun) a behavioral attribute that is distinctive and peculiar to an individual | Synonyms: foible, idiosyncrasy |
| manubrium | (noun) the upper part of the breastbone | - |
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| marjoram | (noun) pungent leaves used as seasoning with meats and fowl and in stews and soups and omelets | Synonyms: oregano |
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| (noun) aromatic Eurasian perennial | Synonyms: oregano, Origanum vulgare, pot marjoram, wild marjoram, winter sweet |
| marsupium | (noun) an external abdominal pouch in most marsupials where newborn offspring are suckled | - |
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| martyrdom | (noun) death that is imposed because of the person's adherence of a religious faith or cause | - |
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| (noun) any experience that causes intense suffering | Synonyms: calvary |
| marum | (noun) Mediterranean germander having small hairy leaves and reddish purple flowers; attractive to cats | Synonyms: cat thyme, Teucrium marum |
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| masochism | (noun) sexual pleasure obtained from receiving punishment (physical or psychological) | - |
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| materialism | (noun) (philosophy) the philosophical theory that matter is the only reality | Synonyms: physicalism |
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| (noun) a desire for wealth and material possessions with little interest in ethical or spiritual matters | Synonyms: philistinism |
| maternalism | (noun) motherly care; behavior characteristic of a mother; the practice of acting as a mother does toward her children | - |
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| (noun) the quality of having or showing the tenderness and warmth and affection of or befitting a mother | Synonyms: maternal quality, maternity, motherliness |
| mausoleum | (noun) a large burial chamber, usually above ground | - |
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| maxim | (noun) a saying that is widely accepted on its own merits | Synonyms: axiom |
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| maximum | (noun) the greatest possible degree | Synonyms: level best, utmost, uttermost |
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| (noun) the point on a curve where the tangent changes from positive on the left to negative on the right | - |
| (noun) the largest possible quantity | Synonyms: upper limit |
| mayhem | (noun) the willful and unlawful crippling or mutilation of another person | - |
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| (noun) violent and needless disturbance | Synonyms: havoc |
| mayidism | (noun) a disease caused by deficiency of niacin or tryptophan (or by a defect in the metabolic conversion of tryptophan to niacin); characterized by gastrointestinal disturbances and erythema and nervous or mental disorders; may be caused by malnutrition or alcoholism or other nutritional impairments | Synonyms: Alpine scurvy, maidism, mal de la rosa, mal rosso, pellagra, Saint Ignatius' itch |
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| mealworm | (noun) the larva of beetles of the family Tenebrionidae | - |
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| mechanism | (noun) the technical aspects of doing something | Synonyms: mechanics |
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| (noun) device consisting of a piece of machinery; has moving parts that perform some function | - |
| (noun) (philosophy) the philosophical theory that all phenomena can be explained in terms of physical or biological causes | - |
| (noun) a natural object resembling a machine in structure or function | - |
| (noun) the atomic process that occurs during a chemical reaction | Synonyms: chemical mechanism |
| meconium | (noun) thick dark green mucoid material that is the first feces of a newborn child | - |
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| mediastinum | (noun) the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus | - |
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| medium | (noun) an occupation for which you are especially well suited | Synonyms: metier |
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| (noun) an intervening substance through which signals can travel as a means for communication | - |
| (noun) a means or instrumentality for storing or communicating information | - |
| (noun) (usually plural) transmissions that are disseminated widely to the public | Synonyms: mass medium |
| (noun) the surrounding environment | - |
| (noun) someone who serves as an intermediary between the living and the dead | Synonyms: sensitive, spiritualist |
| (noun) a state that is intermediate between extremes; a middle position | - |
| (noun) (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms | Synonyms: culture medium |
| (noun) (biology) a substance in which specimens are preserved or displayed | - |
| (noun) a liquid with which pigment is mixed by a painter | - |
| (noun) an intervening substance through which something is achieved | - |
| meerschaum | (noun) a pipe having a bowl made of meerschaum | - |
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| (noun) a white clayey mineral | Synonyms: sepiolite |
| megasporangium | (noun) a plant structure that produces megaspores | Synonyms: macrosporangium |
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