| aculeus | (noun) a sharp-pointed process especially a sting of a hymenopterous insect | - |
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| (noun) a stiff sharp-pointed plant process | - |
| aleurone | (noun) granular protein in outermost layer of endosperm of many seeds or cereal grains | - |
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| aleuronic | (adjective) of or related to aleurone | - |
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| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| bleu | (noun) cheese containing a blue mold | Synonyms: blue cheese |
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| coleus | (noun) any of various Old World tropical plants of the genus Coleus having multicolored decorative leaves and spikes of blue flowers | Synonyms: flame nettle |
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| effleurage | (noun) a rhythmic stroking | - |
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| ileum | (noun) the part of the small intestine between the jejunum and the cecum | - |
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| ileus | (noun) blockage of the intestine (especially the ileum) that prevents the contents of the intestine from passing to the lower bowel | Synonyms: intestinal obstruction |
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| interleukin | (noun) any of several lymphokines that promote macrophages and killer T cells and B cells and other components of the immune system | - |
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| isoleucine | (noun) an essential amino acid found in proteins; isomeric with leucine | - |
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| jongleur | (noun) a singer of folk songs | Synonyms: folk singer, minstrel, poet-singer, troubadour |
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| leu | (noun) the basic unit of money in Romania | - |
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| (noun) the basic unit of money in Moldova | - |
| 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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| leucine | (noun) a white crystalline amino acid occurring in proteins that is essential for nutrition; obtained by the hydrolysis of most dietary proteins | - |
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| leucocyte | (noun) blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system | Synonyms: leukocyte, WBC, white blood cell, white blood corpuscle, white cell, white corpuscle |
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| leucocytosis | (noun) an abnormal increase in the number of white blood cells in the blood as a result of infection (as in leukemia) | Synonyms: leukocytosis |
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| leucocytozoan | (noun) parasitic in birds | Synonyms: leucocytozoon |
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| leucocytozoon | (noun) parasitic in birds | Synonyms: leucocytozoan |
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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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| leucothoe | (noun) any plant of the genus Leucothoe; grown for their beautiful white flowers; glossy foliage contains a poisonous substance similar to that found in genus Kalmia | - |
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| leucotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leukotomy, lobotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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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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| leukocyte | (noun) blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system | Synonyms: leucocyte, WBC, white blood cell, white blood corpuscle, white cell, white corpuscle |
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| leukocytosis | (noun) an abnormal increase in the number of white blood cells in the blood as a result of infection (as in leukemia) | Synonyms: leucocytosis |
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| leukoderma | (noun) a congenital skin condition characterized by spots or bands of unpigmented skin | - |
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| leukoencephalitis | (noun) inflammation of the white matter of the brain | - |
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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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| leukotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leucotomy, lobotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| linoleum | (noun) a floor covering | Synonyms: lino |
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| malleus | (noun) the ossicle attached to the eardrum | Synonyms: hammer |
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| mausoleum | (noun) a large burial chamber, usually above ground | - |
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| nucleus | (noun) a part of the cell containing DNA and RNA and responsible for growth and reproduction | Synonyms: cell nucleus, karyon |
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| (noun) any histologically identifiable mass of neural cell bodies in the brain or spinal cord | - |
| (noun) the central structure of the lens that is surrounded by the cortex | Synonyms: lens nucleus |
| (noun) a small group of indispensable persons or things | Synonyms: core, core group |
| (noun) the positively charged dense center of an atom | - |
| (noun) (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail | - |
| petroleum | (noun) a dark oil consisting mainly of hydrocarbons | Synonyms: crude, crude oil, fossil oil, oil, rock oil |
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| pileup | (noun) multiple collisions of vehicles | - |
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| pileus | (noun) a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom | Synonyms: cap |
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| pleura | (noun) the thin serous membrane around the lungs and inner walls of the chest | - |
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| pleural | (adjective) of or relating to the pleura or the walls of the thorax | - |
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| pleuralgia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: costalgia, pleurodynia |
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| pleurisy | (noun) inflammation of the pleura of the lungs (especially the parietal layer) | - |
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| pleurocarp | (noun) a moss having the archegonium or antheridium on a short side branch rather than the main stalk | Synonyms: pleurocarpous moss |
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| pleurocarpous | (adjective) (of mosses) having the archegonia on short lateral branches | - |
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| pleurodont | (noun) an animal having teeth fused with the inner surface of the alveolar ridge without sockets | - |
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| pleurodynia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: costalgia, pleuralgia |
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| pleuropneumonia | (noun) pleurisy and pneumonia | - |
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| pleurothallis | (noun) any of numerous small tufted orchids of the genus Pleurothallis having leathery to fleshy leaves and racemes of 1 to many small flowers | - |
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| pronucleus | (noun) the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote | - |
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| sleuth | (noun) a detective who follows a trail | Synonyms: sleuthhound |
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| (verb) watch, observe, or inquire secretly | Synonyms: snoop, spy, stag |
| sleuthhound | (noun) a breed of large powerful hound of European origin having very acute smell and used in tracking | Synonyms: bloodhound |
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| (noun) a detective who follows a trail | Synonyms: sleuth |
| sleuthing | (noun) a police investigation to determine the perpetrator | Synonyms: detecting, detection, detective work |
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| soleus | (noun) a broad flat muscle in the calf of the leg under the gastrocnemius muscle | Synonyms: soleus muscle |
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