| klebsiella | (noun) a genus of nonmotile rod-shaped Gram-negative enterobacteria; some cause respiratory and other infections | - |
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| kleptomania | (noun) an irresistible impulse to steal in the absence of any economic motive | - |
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| kniphofia | (noun) a plant of the genus Kniphofia having long grasslike leaves and tall scapes of red or yellow drooping flowers | Synonyms: flame-flower, flame flower, flameflower, tritoma |
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| koala | (noun) sluggish tailless Australian arboreal marsupial with grey furry ears and coat; feeds on eucalyptus leaves and bark | Synonyms: kangaroo bear, koala bear, native bear, Phascolarctos cinereus |
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| kohleria | (noun) shrubby herb cultivated for their soft velvety foliage and showy scarlet flowers | - |
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| koinonia | (noun) Christian fellowship or communion with God or with fellow Christians; said in particular of the early Christian community | - |
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| kola | (noun) tree bearing large brown nuts containing e.g. caffeine; source of cola extract | Synonyms: Cola acuminata, goora nut, kola nut, kola nut tree |
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| kookaburra | (noun) Australian kingfisher having a loud cackling cry | Synonyms: Dacelo gigas, laughing jackass |
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| kopiyka | (noun) 100 kopiykas equal 1 hryvnia in Ukraine | - |
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| koruna | (noun) the basic unit of money in Czech Republic | - |
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| (noun) the basic unit of money in Slovakia | - |
| krigia | (noun) any small branched yellow-flowered North American herb of the genus Krigia | - |
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| krona | (noun) the basic unit of money in Iceland | Synonyms: Icelandic krona |
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| (noun) the basic unit of money in Sweden | Synonyms: Swedish krona |
| kurta | (noun) a loose collarless shirt worn by many people on the Indian subcontinent (usually with a salwar or churidars or pyjama) | - |
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| kwacha | (noun) the basic unit of money in Malawi | Synonyms: Malawi kwacha |
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| (noun) the basic unit of money in Zambia | Synonyms: Zambian kwacha |
| kwanza | (noun) the basic unit of money in Angola | - |
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| kwela | (noun) a kind of danceable music popular among black South Africans; includes a whistle among its instruments | - |
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| la | (noun) the syllable naming the sixth (submediant) note of a major or minor scale in solmization | Synonyms: lah |
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| lactosuria | (noun) presence of lactose in the urine; can occur during pregnancy or lactation | - |
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| lacuna | (noun) a blank gap or missing part | Synonyms: blank |
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| laelia | (noun) any of various spectacular plants of the genus Laelia having showy flowers in many colors | - |
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| laguna | (noun) a body of water cut off from a larger body by a reef of sand or coral | Synonyms: lagoon, lagune |
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| lama | (noun) a Tibetan or Mongolian priest of Lamaism | - |
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| lambda | (noun) the craniometric point at the junction of the sagittal and lamboid sutures of the skull | - |
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| (noun) the 11th letter of the Greek alphabet | - |
| lamella | (noun) thin plate | - |
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| (noun) a thin membrane that is one of the calcified layers that form bones | - |
| (noun) any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus | Synonyms: gill |
| lamia | (noun) (folklore) a corpse that rises at night to drink the blood of the living | Synonyms: vampire |
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| lamina | (noun) a thin plate or layer (especially of bone or mineral) | - |
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| lansa | (noun) East Indian tart yellow berrylike fruit | Synonyms: lansat, lanseh, lanset |
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| lantana | (noun) a genus of about 150 species of flowering shrub, commonly known as shrub verbenas or lantanas | - |
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| larva | (noun) the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose | - |
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| lasagna | (noun) very wide flat strips of pasta | Synonyms: lasagne |
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| (noun) baked dish of layers of lasagna pasta with sauce and cheese and meat or vegetables | Synonyms: lasagne |
| latakia | (noun) aromatic Turkish tobacco | - |
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| latria | (noun) the worship given to God alone | Synonyms: adoration |
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| lauhala | (noun) Polynesian screw pine | Synonyms: Pandanus tectorius, textile screw pine |
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| lava | (noun) rock that in its molten form (as magma) issues from volcanoes; lava is what magma is called when it reaches the surface | - |
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| lavalava | (noun) a skirt consisting of a rectangle of calico or printed cotton; worn by Polynesians (especially Samoans) | - |
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| lea | (noun) a field covered with grass or herbage and suitable for grazing by livestock | Synonyms: grazing land, ley, pasture, pasture land, pastureland |
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| (noun) a unit of length of thread or yarn | - |
| lecanora | (noun) any lichen of the genus Lecanora; some used in dyeing; some used for food | - |
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| legionella | (noun) the motile aerobic rod-shaped Gram-negative bacterium that thrives in central heating and air conditioning systems and can cause Legionnaires' disease | Synonyms: Legionella pneumophilia |
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| leiomyoma | (noun) benign tumor of smooth muscle (usually in the uterus or digestive tract) | - |
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| leiomyosarcoma | (noun) sarcoma of smooth muscle; occurs most often digestive tract or uterus or bladder or prostate | - |
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| leipoa | (noun) Australian mound bird; incubates eggs naturally in sandy mounds | Synonyms: Leipoa ocellata, lowan, mallee fowl |
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| lemma | (noun) a subsidiary proposition that is assumed to be true in order to prove another proposition | - |
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| (noun) the heading that indicates the subject of an annotation or a literary composition or a dictionary entry | - |
| (noun) the lower and stouter of the two glumes immediately enclosing the floret in most Gramineae | Synonyms: flowering glume |
| lempira | (noun) the basic unit of money in Honduras; equal to 100 centavos | - |
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| leoncita | (noun) small South American marmoset with silky fur and long nonprehensile tail | Synonyms: lion marmoset, lion monkey, tamarin |
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| lepidophobia | (noun) a morbid fear of snakes | - |
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| lepiota | (noun) any fungus of the genus Lepiota | - |
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| leptospira | (noun) important pathogens causing Weil's disease or canicola fever | - |
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| lespedeza | (noun) shrubby or herbaceous plants widely used for forage, soil improvement, and especially hay in southern United States | Synonyms: bush clover |
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| leucaemia | (noun) malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer | Synonyms: cancer of the blood, leukaemia, leukemia |
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| leucoma | (noun) eye disease consisting of an opaque white spot on the cornea | Synonyms: leukoma |
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| leucopenia | (noun) an abnormal lowering of the white blood cell count | Synonyms: leukopenia |
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| leucorrhea | (noun) discharge of white mucous material from the vagina; often an indication of infection | Synonyms: leukorrhea |
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| leukaemia | (noun) malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer | Synonyms: cancer of the blood, leucaemia, leukemia |
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| leukemia | (noun) malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer | Synonyms: cancer of the blood, leucaemia, leukaemia |
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| leukoderma | (noun) a congenital skin condition characterized by spots or bands of unpigmented skin | - |
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| leukoma | (noun) eye disease consisting of an opaque white spot on the cornea | Synonyms: leucoma |
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| leukopenia | (noun) an abnormal lowering of the white blood cell count | Synonyms: leucopenia |
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| leukorrhea | (noun) discharge of white mucous material from the vagina; often an indication of infection | Synonyms: leucorrhea |
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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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| liana | (noun) a woody climbing usually tropical plant | - |
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| likuta | (noun) 100 makuta equal 1 zaire in Zaire | - |
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| limpa | (noun) a rye bread made with molasses or brown sugar | - |
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| lingua | (noun) a mobile mass of muscular tissue covered with mucous membrane and located in the oral cavity | Synonyms: clapper, glossa, tongue |
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| linguica | (noun) a highly seasoned Portuguese pork sausage flavored with garlic and onions | - |
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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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| lipemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, hyperlipoidemia, lipaemia, lipidaemia, lipidemia, lipoidaemia, lipoidemia |
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| lipidaemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, hyperlipoidemia, lipaemia, lipemia, lipidemia, lipoidaemia, lipoidemia |
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| lipidemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, hyperlipoidemia, lipaemia, lipemia, lipidaemia, lipoidaemia, lipoidemia |
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| lipoidaemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, hyperlipoidemia, lipaemia, lipemia, lipidaemia, lipidemia, lipoidemia |
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| lipoidemia | (noun) presence of excess lipids in the blood | Synonyms: hyperlipaemia, hyperlipemia, hyperlipidaemia, hyperlipidemia, hyperlipoidaemia, hyperlipoidemia, lipaemia, lipemia, lipidaemia, lipidemia, lipoidaemia |
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| lipoma | (noun) a tumor consisting of fatty tissue | Synonyms: adipose tumor |
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| liposarcoma | (noun) sarcoma of fat cells | - |
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| lira | (noun) formerly the basic unit of money in Italy; equal to 100 centesimi | Synonyms: Italian lira |
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| (noun) the basic unit of money in Turkey | Synonyms: Turkish lira |
| (noun) the basic unit of money on Malta; equal to 100 cents | Synonyms: Maltese lira |
| listeria | (noun) any species of the genus Listeria | - |
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| liza | (noun) similar to the striped mullet and takes its place in the Caribbean region | Synonyms: Mugil liza |
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| llama | (noun) wild or domesticated South American cud-chewing animal related to camels but smaller and lacking a hump | - |
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| loasa | (noun) any of various perennial South American plants of the genus Loasa having stinging hairs and showy white or yellow or reddish-orange flowers | - |
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| lobelia | (noun) any plant or flower of the genus Lobelia | - |
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| lochia | (noun) substance discharged from the vagina (cellular debris and mucus and blood) that gradually decreases in amount during the weeks following childbirth | - |
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| logagraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: agraphia, anorthography |
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| loggia | (noun) a roofed arcade or gallery with open sides stretching along the front or side of a building; often at an upper level | - |
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| logomania | (noun) pathologically excessive (and often incoherent) talking | Synonyms: logorrhea |
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| logorrhea | (noun) pathologically excessive (and often incoherent) talking | Synonyms: logomania |
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| lomatia | (noun) any of various ornamental evergreens of the genus Lomatia having attractive fragrant flowers | - |
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| loofa | (noun) the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer | Synonyms: loofah, loufah sponge, luffa |
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| lorica | (noun) a hard protective sheath (as secreted by certain protoctists, for example) | - |
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| lota | (noun) a globular water bottle used in Asia | - |
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| luffa | (noun) any of several tropical annual climbers having large yellow flowers and edible young fruits; grown commercially for the mature fruit's dried fibrous interior that is used as a sponge | Synonyms: dishcloth gourd, rag gourd, sponge gourd, strainer vine |
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| (noun) the dried fibrous part of the fruit of a plant of the genus Luffa; used as a washing sponge or strainer | Synonyms: loofa, loofah, loufah sponge |
| lumma | (noun) 100 lumma equal 1 dram in Armenia | - |
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| lunula | (noun) a crescent-shaped metal ornament of the Bronze Age | - |
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| (noun) the crescent-shaped area at the base of the human fingernail | Synonyms: half-moon, lunule |
| luxuria | (noun) self-indulgent sexual desire (personified as one of the deadly sins) | Synonyms: lust |
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| lymphadenoma | (noun) an abnormally enlarged lymph node | - |
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| lymphangiectasia | (noun) dilatation of a lymph vessel | Synonyms: lymphangiectasis |
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| lymphangioma | (noun) benign angioma consisting of a mass of lymphatic vessels | - |
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| lymphedema | (noun) swelling (usually in the legs) caused by lymph accumulating in the tissues in the affected areas | - |
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| lymphocytopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphopenia |
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| lymphogranuloma | (noun) swelling of a lymph node | - |
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| lymphoma | (noun) a neoplasm of lymph tissue that is usually malignant; one of the four major types of cancer | - |
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| lymphopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphocytopenia |
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| lymphuria | (noun) the presence of lymph in the urine | - |
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