| intumescent | (adjective) abnormally distended especially by fluids or gas | Synonyms: bloated, distended, puffy, swollen, tumescent, tumid, turgid |
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| iridium | (noun) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium | Synonyms: atomic number 77, Ir |
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| ischium | (noun) one of the three sections of the hipbone; situated below the ilium | Synonyms: ischial bone, os ischii |
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| jejunum | (noun) the part of the small intestine between the duodenum and the ileum | - |
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| jorum | (noun) a large drinking bowl | - |
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| (noun) the quantity that a jorum will hold. | - |
| jumbal | (noun) small flat ring-shaped cake or cookie | Synonyms: jumble |
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| jumble | (noun) a theory or argument made up of miscellaneous or incongruous ideas | Synonyms: hodgepodge, patchwork |
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| (noun) small flat ring-shaped cake or cookie | Synonyms: jumbal |
| (noun) a confused multitude of things | Synonyms: clutter, fuddle, mare's nest, muddle, smother, welter |
| (verb) bring into random order | Synonyms: scramble, throw together |
| (verb) assemble without order or sense | Synonyms: confuse, mix up |
| (verb) be all mixed up or jumbled together | Synonyms: mingle |
| jumbled | (adjective) in utter disorder | Synonyms: disorderly, higgledy-piggledy, hugger-mugger, topsy-turvy |
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| jumbo | (adjective) of great mass; huge and bulky | Synonyms: elephantine, gargantuan, giant |
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| jumbojet | (noun) a very large jet plane | Synonyms: jumbo jet |
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| jument | (noun) an animal such as a donkey or ox or elephant used for transporting loads or doing other heavy work | Synonyms: beast of burden |
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| jumentous | (adjective) smelling strongly like a beast of burden | - |
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| jump | (noun) the act of jumping; propelling yourself off the ground | Synonyms: jumping |
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| (noun) a sudden involuntary movement | Synonyms: start, startle |
| (noun) descent with a parachute | Synonyms: parachuting |
| (noun) (film) an abrupt transition from one scene to another | - |
| (noun) an abrupt transition | Synonyms: leap, saltation |
| (noun) a sudden and decisive increase | Synonyms: leap |
| (verb) increase suddenly and significantly | - |
| (verb) rise in rank or status | Synonyms: climb up, rise |
| (verb) go back and forth; swing back and forth between two states or conditions | Synonyms: alternate |
| (verb) pass abruptly from one state or topic to another | Synonyms: leap |
| (verb) bypass | Synonyms: pass over, skip, skip over |
| (verb) make a sudden physical attack on | - |
| (verb) enter eagerly into | - |
| (verb) move forward by leaps and bounds | Synonyms: bound, leap, spring |
| (verb) cause to jump or leap | Synonyms: leap |
| (verb) move or jump suddenly, as if in surprise or alarm | Synonyms: start, startle |
| (verb) run off or leave the rails | Synonyms: derail |
| (verb) start (a car engine whose battery is dead) by connecting it to another car's battery | Synonyms: jump-start, jumpstart |
| (verb) jump down from an elevated point | Synonyms: jump off, leap |
| (verb) jump from an airplane and descend with a parachute | Synonyms: chute, parachute |
| (verb) be highly noticeable | Synonyms: jump out, leap out, stand out, stick out |
| jumper | (noun) (basketball) a player releases the basketball at the high point of a jump | Synonyms: jump shot |
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| (noun) a sleeveless dress resembling an apron; worn over other clothing | Synonyms: pinafore, pinny |
| (noun) a loose jacket or blouse worn by workmen | - |
| (noun) a small connector used to make temporary electrical connections | - |
| (noun) a coverall worn by children | - |
| (noun) a crocheted or knitted garment covering the upper part of the body | Synonyms: sweater |
| (noun) an athlete who competes at jumping | - |
| (noun) a person who jumps | - |
| jumpiness | (noun) the anxious feeling you have when you have the jitters | Synonyms: jitteriness, nervousness, restiveness |
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| jumping | (noun) the act of participating in an athletic competition in which you must jump | - |
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| (noun) the act of jumping; propelling yourself off the ground | Synonyms: jump |
| jumpstart | (noun) starting an automobile engine that has a weak battery by means of jumper cables to another car | Synonyms: jump-start |
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| (verb) start or re-start vigorously | Synonyms: jump-start |
| (verb) start (a car engine whose battery is dead) by connecting it to another car's battery | Synonyms: jump-start, jump |
| jumpsuit | (noun) one-piece garment fashioned after a parachutist's uniform | Synonyms: jump suit |
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| jumpy | (adjective) causing or characterized by jolts and irregular movements | Synonyms: bumpy, jolting, jolty, rocky, rough |
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| (adjective) being in a tense state | Synonyms: edgy, high-strung, highly strung, jittery, nervy, overstrung, restive, uptight |
| kalumpang | (noun) large tree of Old World tropics having foul-smelling orange-red blossoms followed by red pods enclosing oil-rich seeds sometimes used as food | Synonyms: Java olives, Sterculia foetida |
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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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| khoum | (noun) 5 khoums equal 1 ouguiya in Mauritania | - |
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| koumiss | (noun) an alcoholic beverage made from fermented mare's milk; made originally by nomads of central Asia | Synonyms: kumis |
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| krummhorn | (noun) a Renaissance woodwind with a double reed and a curving tube (crooked horn) | Synonyms: cromorne, crumhorn |
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| kumis | (noun) an alcoholic beverage made from fermented mare's milk; made originally by nomads of central Asia | Synonyms: koumiss |
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| kummel | (noun) liqueur flavored with caraway seed or cumin | - |
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| kumquat | (noun) small oval citrus fruit with thin sweet rind and very acid pulp | - |
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| (noun) any of several trees or shrubs of the genus Fortunella bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp | Synonyms: cumquat, kumquat tree |
| 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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| lactalbumin | (noun) albumin occurring in milk | - |
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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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| 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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| 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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| lebensraum | (noun) space sought for occupation by a nation whose population is expanding | Synonyms: living space |
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| legume | (noun) the seedpod of a leguminous plant (such as peas or beans or lentils) | - |
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| (noun) an erect or climbing bean or pea plant of the family Leguminosae | Synonyms: leguminous plant |
| (noun) the fruit or seed of any of various bean or pea plants consisting of a case that splits along both sides when ripe and having the seeds attach to one side of the case | - |
| leguminous | (adjective) relating to or consisting of legumes | - |
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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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| liebfraumilch | (noun) a sweetened Rhenish wine (especially one from Hesse in western Germany) | - |
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| lignum | (noun) woody tissue | - |
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| linoleum | (noun) a floor covering | Synonyms: lino |
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| 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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| locum | (noun) someone (physician or clergyman) who substitutes temporarily for another member of the same profession | Synonyms: locum tenens |
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| lumbago | (noun) backache affecting the lumbar region or lower back; can be caused by muscle strain or arthritis or vascular insufficiency or a ruptured intervertebral disc | Synonyms: lumbar pain |
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| lumbar | (adjective) of or relating to or near the part of the back between the ribs and the hipbones | - |
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| lumber | (noun) an implement used in baseball by the batter | Synonyms: baseball bat |
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| (noun) the wood of trees cut and prepared for use as building material | Synonyms: timber |
| (verb) cut lumber, as in woods and forests | Synonyms: log |
| (verb) move heavily or clumsily | Synonyms: pound |
| lumbering | (adjective) slow and laborious because of weight | Synonyms: heavy, ponderous |
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| (noun) the trade of cutting or preparing or selling timber | - |
| lumberjack | (noun) a short warm outer jacket | Synonyms: lumber jacket |
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| (noun) a person who fells trees | Synonyms: faller, feller, logger, lumberman |
| lumberman | (noun) a person who fells trees | Synonyms: faller, feller, logger, lumberjack |
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| lumbermill | (noun) a mill for dressing logs and lumber | Synonyms: sawmill |
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| lumberyard | (noun) a workplace where lumber is stocked for sale | - |
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| lumbosacral | (adjective) of or relating to or near the small of the back and the back part of the pelvis between the hips | - |
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| lumbus | (noun) either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds | Synonyms: loin |
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| lumen | (noun) a cavity or passage in a tubular organ | - |
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| (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: lm |
| luminaire | (noun) an electrical device used to create artificial light by use of an electric lamp; all light fixtures have a fixture body and a light socket to hold the lamp and allow for its replacement | Synonyms: light fitting, light fixture |
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| luminance | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminosity, luminousness |
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| luminary | (noun) a celebrity who is an inspiration to others | Synonyms: guiding light, leading light, notability, notable |
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| luminesce | (verb) be or become luminescent; exhibit luminescence | - |
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| luminescence | (noun) light from nonthermal sources | Synonyms: glow |
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| (noun) light not due to incandescence; occurs at low temperatures | - |
| luminescent | (adjective) emitting light not caused by heat | - |
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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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| luminosity | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminance, luminousness |
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| luminous | (adjective) softly bright or radiant | Synonyms: aglow, lambent, lucent |
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| luminousness | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminance, luminosity |
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| lumma | (noun) 100 lumma equal 1 dram in Armenia | - |
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| lummox | (noun) an awkward stupid person | Synonyms: clod, gawk, goon, lout, lubber, lump, oaf, stumblebum |
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| lump | (noun) a compact mass | Synonyms: ball, chunk, clod, clump, glob |
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| (noun) a large piece of something without definite shape | Synonyms: hunk |
| (noun) an awkward stupid person | Synonyms: clod, gawk, goon, lout, lubber, lummox, oaf, stumblebum |
| (noun) an abnormal protuberance or localized enlargement | Synonyms: puffiness, swelling |
| (verb) group or chunk together in a certain order or place side by side | Synonyms: chunk, collocate |
| (verb) put together indiscriminately | Synonyms: chunk |
| lumpectomy | (noun) surgical removal of a tumor without removing much of the surrounding tissue or lymph nodes; performed in some cases of breast cancer | - |
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| lumpen | (adjective) mentally sluggish | Synonyms: lumpish, unthinking |
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| lumpenproletariat | (noun) (Marxism) the unorganized lower levels of the proletariat who are not interested in revolutionary advancement | - |
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| lumper | (noun) a taxonomist who classifies organisms into large groups on the basis of major characteristics | - |
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| (noun) a laborer who loads and unloads vessels in a port | Synonyms: dock-walloper, dock worker, docker, dockhand, dockworker, loader, longshoreman, stevedore |
| lumpfish | (noun) clumsy soft thick-bodied northern Atlantic fish with pelvic fins fused into a sucker; edible roe used for caviar | Synonyms: Cyclopterus lumpus |
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| lumpiness | (noun) The property of being full of lumps, not being smooth. | - |
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| lumpish | (adjective) mentally sluggish | Synonyms: lumpen, unthinking |
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| lumpsucker | (noun) any of several very small lumpfishes | - |
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| lumpy | (adjective) having lumps; not smooth and even in texture | - |
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| (adjective) like or containing small sticky lumps | Synonyms: chunky |
| 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 |
| macrosporangium | (noun) a plant structure that produces megaspores | Synonyms: megasporangium |
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| macumba | (noun) a Brazilian religious cult of African origin; combines voodoo elements with singing and chanting and dancing | - |
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| (noun) popular dance music of Brazil; derived from the practices of the macumba religious cult | - |
| (noun) (Brazil) followers of a religious cult of African origin | - |
| 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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| magnum | (noun) a large wine bottle for liquor or wine | - |
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| manubrium | (noun) the upper part of the breastbone | - |
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| manumission | (noun) the formal act of freeing from slavery | - |
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| manumit | (verb) free from slavery or servitude | Synonyms: emancipate |
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| manumitter | (noun) someone who frees others from bondage | Synonyms: emancipator |
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| marsupium | (noun) an external abdominal pouch in most marsupials where newborn offspring are suckled | - |
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| marum | (noun) Mediterranean germander having small hairy leaves and reddish purple flowers; attractive to cats | Synonyms: cat thyme, Teucrium marum |
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| marumi | (noun) shrub bearing round-fruited kumquats | Synonyms: Fortunella japonica, marumi kumquat, round kumquat |
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| mausoleum | (noun) a large burial chamber, usually above ground | - |
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| maximum | (adjective) the greatest or most complete or best possible | Synonyms: maximal |
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| (noun) the greatest possible degree | Synonyms: level best, utmost, uttermost |
| (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 |
| 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 | (adjective) (meat) cooked until there is just a little pink meat inside | - |
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| (adjective) around the middle of a scale of evaluation | Synonyms: average, intermediate |
| (noun) an occupation for which you are especially well suited | Synonyms: metier |
| (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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| meitnerium | (noun) a radioactive transuranic element, with atomic number 109 | Synonyms: atomic number 109, element 109, Mt |
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| memorandum | (noun) a written proposal or reminder | Synonyms: memo, memoranda |
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