| acanthion | (noun) the craniometric point at the anterior extremity of the intermaxillary suture | - |
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| azathioprine | (noun) an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ | Synonyms: Imuran |
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| gnathion | (noun) the most inferior point of the mandible in the midline | - |
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| isothiocyanate | (noun) a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations | - |
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| malathion | (noun) a yellow insecticide used as a dust or spray to control garden pests and house flies and mites | - |
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| methionine | (noun) a crystalline amino acid containing sulfur; found in most proteins and essential for nutrition | - |
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| parathion | (noun) a colorless and odorless toxic oil used as an insecticide | - |
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| propylthiouracil | (noun) a crystalline compound used as an antithyroid drug in the treatment of goiter | - |
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| prosthion | (noun) craniometric point that is the most anterior point in the midline on the alveolar process of the maxilla | Synonyms: alveolar point, prostheon |
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| struthiomimus | (noun) small light-boned toothless dinosaur resembling an ostrich in size and proportions | - |
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| 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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