| listener | (noun) someone who listens attentively | Synonyms: attender, auditor, hearer |
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| listenership | (noun) all the listeners collectively of a particular radio programme, station, or broadcaster. | - |
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| listening | (noun) the act of hearing attentively | Synonyms: hearing |
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| lister | (noun) moldboard plow with a double moldboard designed to move dirt to either side of a central furrow | Synonyms: lister plough, lister plow, middle buster, middlebreaker |
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| (noun) assessor who makes out the tax lists | - |
| listeria | (noun) any species of the genus Listeria | - |
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| listeriosis | (noun) an infectious disease of animals and humans (especially newborn or immunosuppressed persons) caused by the bacterium Listeria monocytogenes; in sheep and cattle the infection frequently involves the central nervous system and causes various neurological symptoms | Synonyms: listeria meningitis |
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| lobster | (noun) any of several edible marine crustaceans of the families Homaridae and Nephropsidae and Palinuridae | - |
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| (noun) flesh of a lobster | - |
| lobsterback | (noun) British soldier; so-called because of his red coat (especially during the American Revolution) | Synonyms: redcoat |
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| lobsterman | (noun) a person whose occupation is catching lobsters | - |
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| lockmaster | (noun) a worker in charge of a lock (on a canal) | Synonyms: lockkeeper, lockman |
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| lockstep | (noun) a manner of marching in file in which each person's leg moves with and behind the corresponding leg of the person ahead | - |
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| (noun) a standard procedure that is followed mindlessly | - |
| luster | (noun) a surface coating for ceramics or porcelain | Synonyms: lustre |
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| (noun) a quality that outshines the usual | Synonyms: brilliancy, lustre, splendor, splendour |
| (noun) the visual property of something that shines with reflected light | Synonyms: lustre, sheen, shininess |
| lusterless | (adjective) lacking luster or shine | Synonyms: lackluster, lacklustre, lustreless |
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| (adjective) lacking brilliance or vitality | Synonyms: lackluster, lacklustre, lustreless |
| lusterlessness | (noun) the property of having little or no contrast; lacking highlights or gloss | Synonyms: flatness, lustrelessness, mat, matt, matte |
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| lusterware | (noun) pottery with a metallic sheen produced by adding metallic oxides to the glaze | - |
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| magisterial | (adjective) of or relating to a magistrate | - |
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| (adjective) used of a person's appearance or behavior; befitting an eminent person | Synonyms: distinguished, grand, imposing |
| (adjective) offensively self-assured or given to exercising usually unwarranted power | Synonyms: autocratic, bossy, dominating, high-and-mighty, peremptory |
| magisterially | (adverb) in an authoritative and magisterial manner | Synonyms: authoritatively |
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| (adverb) in an overbearingly domineering manner; as a dictator | Synonyms: autocratically, dictatorially |
| maladjusted | (adjective) poorly adjusted to demands and stresses of daily living | - |
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| (adjective) emotionally unstable and having difficulty coping with personal relationships | Synonyms: disturbed |
| (adjective) not well adjusted | - |
| maltster | (noun) a maker of malt | Synonyms: maltman |
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| mangosteen | (noun) two- to three-inch tropical fruit with juicy flesh suggestive of both peaches and pineapples | - |
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| (noun) East Indian tree with thick leathery leaves and edible fruit | Synonyms: Garcinia mangostana, mangosteen tree |
| mastectomy | (noun) surgical removal of a breast to remove a malignant tumor | - |
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| masted | (adjective) having or furnished with a mast; often used in combination | - |
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| master | (adjective) most important element | Synonyms: chief, main, primary, principal |
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| (noun) an original creation (i.e., an audio recording) from which copies can be made | Synonyms: master copy, original |
| (noun) key that secures entrance everywhere | Synonyms: master key, passe-partout, passkey |
| (noun) an artist of consummate skill | Synonyms: maestro |
| (noun) a combatant who is able to defeat rivals | Synonyms: superior, victor |
| (noun) an authority qualified to teach apprentices | Synonyms: professional |
| (noun) directs the work of others | - |
| (noun) a person who has general authority over others | Synonyms: lord, overlord |
| (noun) someone who holds a master's degree from academic institution | - |
| (noun) presiding officer of a school | Synonyms: headmaster, schoolmaster |
| (noun) an officer who is licensed to command a merchant ship | Synonyms: captain, sea captain, skipper |
| (verb) have a firm understanding or knowledge of; be on top of | Synonyms: control |
| (verb) be or become completely proficient or skilled in | Synonyms: get the hang |
| (verb) get on top of; deal with successfully | Synonyms: get over, overcome, subdue, surmount |
| (verb) have dominance or the power to defeat over | Synonyms: dominate |
| mastered | (adjective) understood perfectly | Synonyms: down, down pat |
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| masterful | (adjective) having or revealing supreme mastery or skill | Synonyms: consummate, masterly, virtuoso |
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| masterfully | (adverb) in a skillfully masterful manner; with the skill of a master | - |
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| mastering | (noun) the act of making a master recording from which copies can be made | - |
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| (noun) becoming proficient in the use of something; having mastery of | - |
| masterless | (adjective) having no lord or master | Synonyms: lordless |
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| masterly | (adjective) having or revealing supreme mastery or skill | Synonyms: consummate, masterful, virtuoso |
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| mastermind | (noun) someone who creates new things | Synonyms: conceiver, originator |
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| (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, brainiac, Einstein, genius |
| (verb) plan and direct (a complex undertaking) | Synonyms: direct, engineer, orchestrate, organise, organize |
| masterpiece | (noun) an outstanding achievement | - |
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| (noun) the most outstanding work of a creative artist or craftsman | Synonyms: chef-d'oeuvre |
| mastership | (noun) the position of master | - |
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| (noun) the skill of a master | - |
| masterstroke | (noun) an achievement demonstrating great skill or mastery | - |
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| masterwort | (noun) any plant of the genus Astrantia | Synonyms: astrantia |
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| mastery | (noun) the act of mastering or subordinating someone | Synonyms: subordination |
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| (noun) great skillfulness and knowledge of some subject or activity | Synonyms: command, control |
| (noun) power to dominate or defeat | Synonyms: domination, supremacy |
| medroxyprogesterone | (noun) a progestin compound (trade name Provera) used to treat menstrual disorders | Synonyms: Provera |
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| meristem | (noun) undifferentiated tissue from which new cells are formed, as at the tip of a stem or root | - |
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| methyltestosterone | (noun) an androgenic compound contained in drugs that are used to treat testosterone deficiency and female breast cancer and to stimulate growth and weight gain | - |
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| midwestern | (adjective) of a region of the United States generally including Ohio, Indiana, Illinois, Iowa, Missouri, Kansas, Nebraska, and sometimes Michigan, Wisconsin, Minnesota | - |
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| minister | (noun) the job of a head of a government department | - |
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| (noun) a person authorized to conduct religious worship | Synonyms: curate, minister of religion, parson, pastor, rector |
| (noun) a diplomat representing one government to another; ranks below ambassador | Synonyms: diplomatic minister |
| (noun) a person appointed to a high office in the government | Synonyms: government minister |
| (verb) work as a minister | - |
| (verb) attend to the wants and needs of others | - |
| ministerial | (adjective) of or relating to a government minister or ministry | - |
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| (adjective) of or relating to a minister of religion or the minister's office | - |
| ministerially | (adverb) in the manner of a minister or clergyman | - |
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| minster | (noun) any of certain cathedrals and large churches; originally connected to a monastery | - |
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| misstep | (noun) an unintentional but embarrassing blunder | Synonyms: stumble, trip-up, trip |
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| mobster | (noun) a criminal who is a member of gang | Synonyms: gangster |
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| modiste | (noun) a woman who makes or mends dresses | Synonyms: needlewoman, seamstress, sempstress |
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| (noun) someone who makes and sells hats | Synonyms: hatmaker, hatter, milliner |
| moisten | (verb) make moist | Synonyms: dampen, wash |
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| (verb) moisten with fine drops | Synonyms: drizzle |
| moistener | (noun) a device that dampens or moistens something | Synonyms: dampener |
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| moistening | (noun) the act of making something slightly wet | Synonyms: dampening |
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| molester | (noun) someone who subjects others to unwanted or improper sexual activities | - |
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| monastery | (noun) the residence of a religious community | - |
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| monster | (noun) (medicine) a grossly malformed and usually nonviable fetus | Synonyms: teras |
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| (noun) a cruel wicked and inhuman person | Synonyms: demon, devil, fiend, ogre |
| (noun) a person or animal that is markedly unusual or deformed | Synonyms: freak, lusus naturae, monstrosity |
| (noun) an imaginary creature usually having various human and animal parts | - |
| (noun) someone that is abnormally large and powerful | Synonyms: behemoth, colossus, giant, goliath |
| monstera | (noun) tropical cylindrical fruit resembling a pinecone with pineapple-banana flavor | Synonyms: ceriman |
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| (noun) any plant of the genus Monstera; often grown as houseplants | - |
| mustelid | (noun) fissiped fur-bearing carnivorous mammals | Synonyms: musteline, musteline mammal |
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| musteline | (noun) fissiped fur-bearing carnivorous mammals | Synonyms: mustelid, musteline mammal |
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| muster | (noun) compulsory military service | Synonyms: conscription, draft, selective service |
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| (noun) a gathering of military personnel for duty | - |
| (verb) call to duty, military service, jury duty, etc. | - |
| (verb) gather or bring together | Synonyms: come up, muster up, rally, summon |
| mycosterol | (noun) a kind of sterol found in fungi. | - |
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| mysterious | (adjective) having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding | Synonyms: mystic, mystical, occult, orphic, secret |
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| (adjective) of an obscure nature | Synonyms: cryptic, cryptical, deep, inscrutable, mystifying |
| mysteriously | (adverb) in a cryptic manner | Synonyms: cryptically, enigmatically |
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| mystery | (noun) something that baffles understanding and cannot be explained | Synonyms: closed book, enigma, secret |
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| (noun) a story about a crime (usually murder) presented as a novel or play or movie | Synonyms: mystery story, whodunit |
| nester | (noun) a bird that has built (or is building) a nest | - |
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| (noun) someone who settles lawfully on government land with the intent to acquire title to it | Synonyms: homesteader, squatter |
| newscaster | (noun) someone who broadcasts the news | - |
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| nonexistence | (noun) the state of not existing | Synonyms: nonentity |
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| nonexistent | (adjective) not having existence or being or actuality | - |
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| nonsteroid | (noun) an organic compound that does no contain a steroid | Synonyms: nonsteroidal |
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| nonsteroidal | (adjective) not steroidal or not having the effects of steroid hormones | - |
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| (noun) an organic compound that does no contain a steroid | Synonyms: nonsteroid |
| noreaster | (noun) a storm blowing from the northeast | Synonyms: northeaster |
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| northeaster | (noun) a storm blowing from the northeast | Synonyms: noreaster |
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| northeasterly | (adjective) situated in or oriented toward the northeast | Synonyms: northeast, northeastern |
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| (adjective) coming from the northeast | Synonyms: northeast |
| northeastern | (adjective) of a region of the United States generally including the New England states, New York, and sometimes New Jersey and Pennsylvania | - |
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| (adjective) situated in or oriented toward the northeast | Synonyms: northeast, northeasterly |
| northwester | (noun) a wind from the northwest | Synonyms: northwest wind |
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| northwesterly | (adjective) situated in or oriented toward the northwest | Synonyms: northwest, northwestern |
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| (adjective) coming from the northwest | Synonyms: northwest |
| northwestern | (adjective) situated in or oriented toward the northwest | Synonyms: northwest, northwesterly |
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| (adjective) of a region of the United States generally including Washington, Oregon, Idaho, and sometimes Montana, Wyoming | - |
| obstetric | (adjective) of or relating to or used in or practicing obstetrics | Synonyms: obstetrical |
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| obstetrical | (adjective) of or relating to or used in or practicing obstetrics | Synonyms: obstetric |
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| obstetrician | (noun) a physician specializing in obstetrics | Synonyms: accoucheur |
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| obstetrics | (noun) the branch of medicine dealing with childbirth and care of the mother | Synonyms: midwifery, OB, tocology |
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| oersted | (noun) the magnetic field strength 1 cm from a unit magnetic pole | - |
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| oldster | (noun) an elderly person | Synonyms: golden ager, old person, senior citizen |
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| oleaster | (noun) any of several shrubs of the genus Elaeagnus having silver-white twigs and yellow flowers followed by olivelike fruits | - |
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| osteal | (adjective) composed of or containing bone | Synonyms: bony, osseous |
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| (adjective) relating to bone or to the skeleton | - |
| osteitis | (noun) inflammation of a bone as a consequence of infection or trauma or degeneration | - |
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| ostensibility | (noun) The quality of being professed, supposed rather than demonstrably true or real. | - |
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| ostensible | (adjective) represented or appearing as such; pretended | Synonyms: ostensive |
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| (adjective) appearing as such but not necessarily so | Synonyms: apparent, seeming |
| ostensibly | (adverb) from appearances alone | Synonyms: apparently, on the face of it, seemingly |
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| ostensive | (adjective) represented or appearing as such; pretended | Synonyms: ostensible |
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| (adjective) manifestly demonstrative | - |
| ostensorium | (noun) (Roman Catholic Church) a vessel (usually of gold or silver) in which the consecrated Host is exposed for adoration | Synonyms: monstrance |
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| ostentate | (verb) display proudly; act ostentatiously or pretentiously | Synonyms: flash, flaunt, show off, swank |
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| ostentation | (noun) pretentious or showy or vulgar display | - |
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| (noun) lack of elegance as a consequence of being pompous and puffed up with vanity | Synonyms: inflation, ostentatiousness, pomposity, pompousness, pretentiousness, puffiness, splashiness |
| (noun) a gaudy outward display | Synonyms: fanfare, flash |
| ostentatious | (adjective) intended to attract notice and impress others | Synonyms: pretentious |
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| (adjective) (of a display) tawdry or vulgar | Synonyms: pretentious |
| ostentatiously | (adverb) with ostentation; in an ostentatious manner | Synonyms: showily |
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| ostentatiousness | (noun) lack of elegance as a consequence of being pompous and puffed up with vanity | Synonyms: inflation, ostentation, pomposity, pompousness, pretentiousness, puffiness, splashiness |
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| osteoarthritis | (noun) chronic breakdown of cartilage in the joints; the most common form of arthritis occurring usually after middle age | Synonyms: degenerative arthritis, degenerative joint disease |
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| osteoblast | (noun) a cell from which bone develops | Synonyms: bone-forming cell |
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| osteoblastoma | (noun) benign tumor of bone and fibrous tissue; occurs in the vertebrae or femur or tibia or arm bones (especially in young adults) | - |
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| osteochondroma | (noun) benign tumor containing both bone and cartilage; usually occurs near the end of a long bone | - |
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| osteoclasis | (noun) treatment of a skeletal deformity by intentionally fracturing a bone | - |
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| osteoclast | (noun) cell that functions in the breakdown and resorption of bone tissue | - |
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| osteocyte | (noun) mature bone cell | - |
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| osteodystrophy | (noun) defective bone development; usually attributable to renal disease or to disturbances in calcium and phosphorus metabolism | - |
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