| anthracite | (noun) a hard natural coal that burns slowly and gives intense heat | Synonyms: anthracite coal, hard coal |
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| anthracosis | (noun) lung disease caused by inhaling coal dust | Synonyms: black lung, black lung disease, coal miner's lung |
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| anthrax | (noun) a highly infectious animal disease (especially cattle and sheep); it can be transmitted to people | Synonyms: splenic fever |
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| (noun) a disease of humans that is not communicable; caused by infection with Bacillus anthracis followed by septicemia | - |
| arthralgia | (noun) pain in a joint or joints | - |
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| birthrate | (noun) the ratio of live births in an area to the population of that area; expressed per 1000 population per year | Synonyms: birth rate, fertility, fertility rate, natality |
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| deathrate | (noun) the ratio of deaths in an area to the population of that area; expressed per 1000 per year | Synonyms: death rate, fatality rate, mortality, mortality rate |
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| enthrallment | (noun) a feeling of great liking for something wonderful and unusual | Synonyms: captivation, enchantment, fascination |
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| mithramycin | (noun) an antineoplastic drug (trade name Mithracin) used to treat cancer of the testes | Synonyms: Mithracin |
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| thraldom | (noun) the state of being under the control of another person | Synonyms: bondage, slavery, thrall, thralldom |
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| thrall | (noun) someone held in bondage | - |
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| (noun) the state of being under the control of another person | Synonyms: bondage, slavery, thraldom, thralldom |
| thralldom | (noun) the state of being under the control of another person | Synonyms: bondage, slavery, thraldom, thrall |
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| thrash | (noun) a swimming kick used while treading water | - |
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| thrasher | (noun) thrush-like American songbird able to mimic other birdsongs | Synonyms: mocking thrush |
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| (noun) large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed | Synonyms: Alopius vulpinus, fox shark, thresher, thresher shark |
| (noun) a farm machine for separating seeds or grain from the husks and straw | Synonyms: thresher, threshing machine |
| thrashing | (noun) the act of inflicting corporal punishment with repeated blows | Synonyms: beating, drubbing, lacing, licking, trouncing, whacking |
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| (noun) a sound defeat | Synonyms: debacle, drubbing, slaughter, trouncing, walloping, whipping |
| urethra | (noun) duct through which urine is discharged in most mammals and which serves as the male genital duct | - |
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