| laparoscope | (noun) a slender endoscope inserted through an incision in the abdominal wall in order to examine the abdominal organs or to perform minor surgery | - |
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| laparoscopy | (noun) laparotomy performed with a laparoscope that makes a small incision to examine the abdominal cavity (especially the ovaries and Fallopian tubes) | - |
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| laparotomy | (noun) surgical incision into the abdominal wall; often done to examine abdominal organs | - |
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| laryngospasm | (noun) a closure of the larynx that blocks the passage of air to the lungs | - |
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| launchpad | (noun) a platform from which rockets or space craft are launched | Synonyms: launch area, launch pad, launching pad, pad |
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| leopard | (noun) large feline of African and Asian forests usually having a tawny coat with black spots | Synonyms: Panthera pardus |
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| (noun) the pelt of a leopard | - |
| leopardbane | (noun) any of several herbs of the genus Doronicum having alternate often clasping stem leaves cultivated for their long stalks of yellow flower heads | Synonyms: leopard's-bane |
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| leopardess | (noun) female leopard | - |
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| levodopa | (noun) the levorotatory form of dopa (trade names Bendopa and Brocadopa and Larodopa); as a drug it is used to treat Parkinson's disease | Synonyms: Bendopa, Brocadopa, L-dopa, Larodopa |
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| lifespan | (noun) the period during which something is functional (as between birth and death) | Synonyms: life-time, life, lifetime |
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| limpa | (noun) a rye bread made with molasses or brown sugar | - |
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| lipaemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, hyperlipoidemia, lipemia, lipidaemia, lipidemia, lipoidaemia, lipoidemia |
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| liparis | (noun) an orchid of the genus Liparis having few leaves and usually fairly small yellow-green or dull purple flowers in terminal racemes | - |
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| lipase | (noun) an enzyme secreted in the digestive tract that catalyzes the breakdown of fats into individual fatty acids that can be absorbed into the bloodstream | - |
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| lorazepam | (noun) tranquilizer (trade name Ativan) used to treat anxiety and tension and insomnia | Synonyms: Ativan |
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| lymphadenopathy | (noun) chronic abnormal enlargement of the lymph nodes (usually associated with disease) | - |
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| marchpane | (noun) almond paste and egg whites | Synonyms: marzipan |
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| marupa | (noun) tree of the Amazon valley yielding a light brittle timber locally regarded as resistant to insect attack | Synonyms: Simarouba amara |
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| marzipan | (noun) almond paste and egg whites | Synonyms: marchpane |
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| mastopathy | (noun) any pathology of the breast | Synonyms: mazopathy |
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| mazopathy | (noun) any pathology of the breast | Synonyms: mastopathy |
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| meatpacking | (noun) wholesale packaging of meat for future sale (including slaughtering and processing and distribution to retailers) | Synonyms: meat-packing business, meat packing |
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| megalohepatia | (noun) abnormal enlargement of the liver | Synonyms: hepatomegaly |
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| menopausal | (adjective) of or relating to the menopause | - |
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| menopause | (noun) the time in a woman's life in which the menstrual cycle ends | Synonyms: change of life, climacteric |
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| mepacrine | (noun) a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria | Synonyms: Atabrine, quinacrine, quinacrine hydrochloride |
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| metacarpal | (adjective) of or relating to the metacarpus | - |
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| (noun) any bone of the hand between the wrist and fingers | Synonyms: metacarpal bone |
| methyldopa | (noun) antihypertensive drug (trade name Aldomet) used in the treatment of high blood pressure | Synonyms: Aldomet, alpha methyl dopa |
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| micropaleontology | (noun) the paleontology of microfossils | - |
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| mishpachah | (noun) (Yiddish) the entire family network of relatives by blood or marriage (and sometimes close friends) | Synonyms: mishpocha |
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| mononeuropathy | (noun) any neuropathy of a single nerve trunk | - |
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| mousepad | (noun) a small portable pad that provides traction for the ball of a computer mouse | Synonyms: mouse mat |
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| mouthpart | (noun) any part of the mouth of an insect or other arthropod especially one adapted to a specific way of feeding | - |
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| multiparous | (adjective) producing more than one offspring at a time | - |
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| multipartite | (adjective) involving more than two parties | - |
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| municipal | (adjective) relating or belonging to or characteristic of a municipality | - |
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| (adjective) of or relating to the government of a municipality | - |
| municipality | (noun) people living in a town or city having local self-government | - |
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| (noun) an urban district having corporate status and powers of self-government | - |
| municipally | (adverb) by municipality | - |
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| myocardiopathy | (noun) a disorder (usually of unknown origin) of the heart muscle (myocardium) | Synonyms: cardiomyopathy |
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| myopathic | (adjective) of or relating to any disease of the muscles that is not caused by nerve dysfunction | - |
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| myopathy | (noun) any pathology of the muscles that is not attributable to nerve dysfunction | - |
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| napa | (noun) plant with an elongated head of broad stalked leaves resembling celery; used as a vegetable in east Asia | Synonyms: Brassica rapa pekinensis, celery cabbage, Chinese cabbage, pe-tsai |
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| napalm | (noun) gasoline jelled with aluminum soaps; highly incendiary liquid used in fire bombs and flamethrowers | - |
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| naprapath | (noun) a therapist who practices naprapathy | - |
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| naprapathy | (noun) a drugless method of treatment based on the belief that disease symptoms arise from problems with ligaments and connective tissues | - |
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| naturopath | (noun) a therapist who practices naturopathy | - |
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| naturopathy | (noun) a method of treating disease using food and exercise and heat to assist the natural healing process | - |
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| naupathia | (noun) motion sickness experienced while traveling on water | Synonyms: mal de mer, seasickness |
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| neopallium | (noun) the cortical part of the neencephalon | Synonyms: neocortex |
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| nephropathy | (noun) a disease affecting the kidneys | Synonyms: kidney disease, nephrosis, renal disorder |
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| neuropathy | (noun) any pathology of the peripheral nerves | - |
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| newspaper | (noun) the physical object that is the product of a newspaper publisher | Synonyms: paper |
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| (noun) a daily or weekly publication on folded sheets; contains news and articles and advertisements | Synonyms: paper |
| (noun) a business firm that publishes newspapers | Synonyms: newspaper publisher, paper |
| (noun) cheap paper made from wood pulp and used for printing newspapers | Synonyms: newsprint |
| newspapering | (noun) journalism practiced for the newspapers | - |
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| newspaperman | (noun) a male journalist employed to provide news stories for newspapers or broadcast media | Synonyms: pressman |
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| newspaperwoman | (noun) a female journalist employed to provide news stories for newspapers or broadcast media | - |
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| nipa | (noun) made from sap of the Australasian nipa palm | - |
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| nitrazepam | (noun) a hypnotic and sedative drug of the benzodiazepine type | - |
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| nonparallel | (adjective) of or relating to the sequential performance of multiple operations | Synonyms: in series, serial |
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| (adjective) (of e.g. lines or paths) not parallel; converging | - |
| nonparametric | (adjective) not involving an estimation of the parameters of a statistic | - |
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| nonparasitic | (adjective) not parasitic on another organism | Synonyms: free-living, nonsymbiotic |
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| nonpareil | (adjective) eminent beyond or above comparison | Synonyms: matchless, one, one and only, peerless, unmatchable, unmatched, unrivaled, unrivalled |
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| (noun) colored beads of sugar used as a topping on e.g. candies and cookies | - |
| (noun) a flat disk of chocolate covered with beads of colored sugar | - |
| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: apotheosis, ideal, nonesuch, nonsuch, paragon, saint |
| nonpareille | (noun) a 6-point printing type: a size smaller than minion. | - |
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| nonparticipant | (noun) a person who does not participate | - |
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| nonparticipation | (noun) withdrawing from the activities of a group | Synonyms: non-engagement, non-involvement |
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| nonparticulate | (adjective) not composed of distinct particles | - |
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| nonpartisan | (adjective) free from party affiliation or bias | Synonyms: nonpartizan |
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| (noun) a person who is nonpartisan | Synonyms: nonpartizan |
| nonpartisanship | (noun) an inclination to weigh both views or opinions equally | Synonyms: impartiality |
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| nonpartizan | (adjective) free from party affiliation or bias | Synonyms: nonpartisan |
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| (noun) a person who is nonpartisan | Synonyms: nonpartisan |
| nonpasserine | (adjective) relating to or characteristic of birds that are not perching birds | - |
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| nonpayment | (noun) the deliberate act of failing to pay money | Synonyms: evasion |
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| (noun) loss resulting from failure of a debt to be paid | Synonyms: default, nonremittal |
| (noun) act of failing to meet a financial obligation | Synonyms: default, nonremittal |
| nonspatial | (adjective) not spatial | - |
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| nopal | (noun) any of several cacti of the genus Nopalea resembling prickly pears | - |
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| (noun) cactus having yellow flowers and purple fruits | Synonyms: Opuntia lindheimeri |
| notepad | (noun) a pad of paper for keeping notes | - |
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| notepaper | (noun) writing paper intended for writing short notes or letters | - |
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| nullipara | (noun) (obstetrics) a woman who has never give birth to a child | - |
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| obstipate | (verb) constipate severely | - |
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| obstipation | (noun) severe constipation resulting from an obstruction in the intestines | - |
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| occupancy | (noun) an act of being a tenant or occupant | Synonyms: tenancy |
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| (noun) the act of occupying or taking possession of a building | Synonyms: moving in, occupation |
| occupant | (noun) someone who lives at a particular place for a prolonged period or who was born there | Synonyms: occupier, resident |
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| occupation | (noun) the principal activity in your life that you do to earn money | Synonyms: business, job, line, line of work |
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| (noun) the act of occupying or taking possession of a building | Synonyms: moving in, occupancy |
| (noun) the control of a country by military forces of a foreign power | Synonyms: military control |
| (noun) any activity that occupies a person's attention | - |
| (noun) the period of time during which a place or position or nation is occupied | - |
| occupational | (adjective) of or relating to the activity or business for which you are trained | - |
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| oilpaper | (noun) paper that has been made translucent and waterproof by soaking in oil | - |
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| opacification | (noun) the process of becoming cloudy or opaque | - |
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| opacify | (verb) become opaque | - |
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| (verb) make opaque | - |
| opacity | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opaqueness |
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| (noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opaqueness |
| (noun) the phenomenon of not permitting the passage of electromagnetic radiation | - |
| opah | (noun) large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean | Synonyms: Lampris regius, moonfish |
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| opal | (noun) a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones | - |
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| opalesce | (verb) exhibit a play of colors like that of an opal | - |
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| (verb) reflect light or colors like an opal | - |
| opalescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: iridescence |
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| opalescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opaline, pearlescent |
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| opaline | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, pearlescent |
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| opalise | (verb) replace or convert into opal | Synonyms: opalize |
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| (verb) make opalescent | Synonyms: opalize |
| opalize | (verb) replace or convert into opal | Synonyms: opalise |
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| (verb) make opalescent | Synonyms: opalise |
| opaque | (adjective) not transmitting or reflecting light or radiant energy; impenetrable to sight | - |
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| (adjective) hard or impossible to understand | Synonyms: unintelligible |
| opaquely | (adverb) in an opaque manner | - |
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| opaqueness | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opacity |
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| (noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opacity |
| opopanax | (noun) an odorous gum resin formerly used in medicines | - |
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| oppa | (noun) a male who is older than the speaker, especially used by Korean female | - |
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| orthopaedic | (adjective) of or relating to orthopedics | Synonyms: orthopedic, orthopedical |
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| orthopaedics | (noun) the branch of medical science concerned with disorders or deformities of the spine and joints | Synonyms: orthopedics |
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