| toxoplasmosis | (noun) infection caused by parasites transmitted to humans from infected cats; if contracted by a pregnant woman it can result in serious damage to the fetus | - |
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| trichiniasis | (noun) infestation by trichina larvae that are transmitted by eating inadequately cooked meat (especially pork); larvae migrate from the intestinal tract to the muscles where they become encysted | Synonyms: myositis trichinosa, trichinosis |
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| trichinosis | (noun) infestation by trichina larvae that are transmitted by eating inadequately cooked meat (especially pork); larvae migrate from the intestinal tract to the muscles where they become encysted | Synonyms: myositis trichinosa, trichiniasis |
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| trichomoniasis | (noun) infection of the vagina | - |
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| trichuriasis | (noun) infestation by a roundworm; common in tropical areas with poor sanitation | - |
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| trombiculiasis | (noun) infestation with chiggers | - |
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| trophobiosis | (noun) a symbiotic relation in which one organism protects the other in return for some kind of food product | - |
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| tuberculosis | (noun) infection transmitted by inhalation or ingestion of tubercle bacilli and manifested in fever and small lesions (usually in the lungs but in various other parts of the body in acute stages) | Synonyms: T.B., TB |
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| uranalysis | (noun) (medicine) the chemical analysis of urine (for medical diagnosis) | Synonyms: urinalysis |
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| ureterostenosis | (noun) stenosis of the ureter | - |
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| urinalysis | (noun) (medicine) the chemical analysis of urine (for medical diagnosis) | Synonyms: uranalysis |
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| varicosis | (noun) pathological condition of being varicose or having varicose veins | - |
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| verticilliosis | (noun) wilt caused by fungi of the genus Verticillium | - |
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| whatsis | (noun) something unspecified whose name is either forgotten or not known | Synonyms: dojigger, doodad, doohickey, gimmick, gismo, gizmo, gubbins, thingamabob, thingamajig, thingmabob, thingmajig, thingumabob, thingumajig, thingummy, whatchamacallit, whatchamacallum, widget |
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| xanthomatosis | (noun) widespread xanthomas (especially on elbows and knees); often associated with a disorder of lipid metabolism | Synonyms: cholesterosis cutis, lipid granulomatosis, lipoid granulomatosis, xanthoma multiplex |
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| xanthosis | (noun) an abnormal yellow discoloration of the skin | - |
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| xenogenesis | (noun) the alternation of two or more different forms in the life cycle of a plant or animal | Synonyms: alternation of generations, heterogenesis |
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| zoonosis | (noun) an animal disease that can be transmitted to humans | Synonyms: zoonotic disease |
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| zymolysis | (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: ferment, fermentation, fermenting, zymosis |
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| zymosis | (noun) (medicine) the development and spread of an infectious disease (especially one caused by a fungus) | - |
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| (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: ferment, fermentation, fermenting, zymolysis |