| thiobacillus | (noun) small rod-shaped bacteria living in sewage or soil and oxidizing sulfur | - |
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| thiobacteria | (noun) any bacterium of the genus Thiobacillus | Synonyms: sulfur bacteria, sulphur bacteria |
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| thiocyanate | (noun) a salt of thiocyanic acid; formed when alkaline cyanides are fused with sulfur | - |
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| thiodiphenylamine | (noun) a compound used primarily in veterinary medicine to rid farm animals of internal parasites | Synonyms: phenothiazine |
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| thioguanine | (noun) an antineoplastic drug used to treat acute leukemias | - |
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| thiopental | (noun) barbiturate that is a hygroscopic powder (trade name Pentothal) that is a strong barbiturate that acts rapidly; induces a relaxed state when injected as a general anesthetic | Synonyms: Pentothal, thiopental sodium, thiopentobarbital sodium |
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| thioridazine | (noun) a tranquilizer (trade name Mellaril) used to treat schizophrenia and other psychotic disorders | Synonyms: Mellaril |
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| thiotepa | (noun) an antineoplastic drug used to treat certain malignancies | - |
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| thiothixene | (noun) a tranquilizer (trade name Navane) used to treat schizophrenia | Synonyms: Navane |
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| thiouracil | (noun) depresses the function of the thyroid gland | - |
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