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| Target Organ |
| | An organ in which a xenobiotic exerts a toxic effect. |
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| TD0 |
| | Toxic Dose 0%. The estimated dose none of the population is expected to exhibit toxic effects. |
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| TD50 |
| | Toxic Dose 50%. The estimated dose at which 50% of the population exhibit toxic effects. |
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| TD90 |
| | Toxic Dose 90%. The estimated dose at which 90% of the population exhibit toxic effects. |
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| Teratogen |
| | A compound that causes birth defects in a developing fetus. |
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| Teratogenesis |
| | The process by which a substance causes the abnormal development of tissues or organs in a developing fetus. |
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| Teratogenicity |
| | The development of birth defects as the result of exposure to a teratogenic toxicant. |
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| Therapeutic Index (TI) |
| | The ratio of the dose needed to produce the desired therapeutic response to the dose producing toxicity. |
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| Threshold Dose |
| | The dose at which a toxic effect is first encountered. |
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| Threshold Limit Value (TLV) |
| | A recommendation by the ACGIH for the highest level of exposure to a chemical that is safe. |
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| TLV |
| | see Threshold Limit Value |
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| Tolerance |
| | The ability to endure unusually large doses of a substance without ill effect. Toxic effects are decreased with continued exposure to the substance. |
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| Total Dose |
| | The sum of all individual doses which may be received over a period of time. |
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| Toxicant |
| | An agent that produces adverse effects when absorbed into the body. |
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| Toxicokinetics |
| | The pharmacokinetics of a toxic chemical. |
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| Toxicologist |
| | A person who studies harmful effects of chemicals including the mechanisms by which the effects are produced and the probability that the effects will occur under specific exposure conditions. |
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| Toxicology |
| | The study of the harmful interactions of chemicals on living organisms and biological systems. |
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| Toxin |
| | A specific protein produced by certain plants, animals and microorganisms that is highly toxic to other organisms (snake venom). |
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| TSCA |
| | Toxic Substances Control Act. It is federal law regulating chemicals in the environment. It is administered by the Environmental Protection Agency. |
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| Tumor |
| | see Neoplasm |
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