| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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| anatoxin | (noun) a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin | Synonyms: toxoid |
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| antitoxin | (noun) an antibody that can neutralize a specific toxin | - |
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| botulismotoxin | (noun) potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon | Synonyms: botulin, botulinus toxin |
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| cytotoxin | (noun) any substance that has a toxic effect on cells | - |
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| digitoxin | (noun) digitalis preparation used to treat congestive heart failure or cardiac arrhythmia | - |
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| digoxin | (noun) digitalis preparation (trade name Lanoxin) used to treat congestive heart failure or cardiac arrhythmia; helps the heart beat more forcefully | Synonyms: Lanoxin |
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| dioxin | (noun) any of several toxic or carcinogenic hydrocarbons that occur as impurities in herbicides | - |
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| endotoxin | (noun) a toxin that is confined inside the microorganisms and is released only when the microorganisms are broken down or die | - |
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| enterotoxin | (noun) a cytotoxin specific for the cells of the intestinal mucosa | - |
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| excitotoxin | (noun) any of a group of neurologically active compounds, such as glutamate and aspartame, that have detrimental excitatory effects on the central nervous system when taken in high concentrations. | - |
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| exotoxin | (noun) a toxin that is secreted by microorganisms into the surrounding medium | - |
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| hepatotoxin | (noun) any toxin that affects the liver | - |
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| mycotoxin | (noun) a toxin produced by a fungus | - |
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| nephrotoxin | (noun) any toxin that affects the kidneys | - |
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| neurotoxin | (noun) any toxin that affects neural tissues | Synonyms: neurolysin |
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| phytotoxin | (noun) any substance produced by plants that is similar in its properties to extracellular bacterial toxin | Synonyms: plant toxin |
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| saxitoxin | (noun) a powerful neurotoxin produced by certain dinoflagellates found in red tides; it can accumulate in mollusks that feed on the dinoflagellates and cause food poisoning to humans | - |
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| tetrodotoxin | (noun) a powerful neurotoxin found in the ovaries of pufferfish | - |
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| thyroxin | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxine |
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| toxin | (noun) a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species | - |
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| zootoxin | (noun) a toxin resembling bacterial toxins in its antigenic properties that is found in the fluids of certain animals | Synonyms: animal toxin |
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