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Tetrachlorodibenzodioxin
Definition 1
2,3,7,8-Tetrachlorodibenzo-p-dioxin which is often referred to simply as dioxin and is the reference for a number of compounds which are similar structurally and have dioxin-like toxicity. A substance extremely toxic to mammals, with a wide variation in sensitivity among species. Longer-term exposure of test mammals to lesser amounts can affect reproduction, cause birth defects, damage the liver and suppress the immune system. Several studies suggest that exposure to TCDD increases the risk of several types of cancer in people. Animal studies have also shown an increased risk of cancer from exposure to TCDD. The WHO and the USA DHHS have determined that TCDD is a human carcinogen. (NCI Thesaurus)
Definition 2
A chemical by-product that results from burning or incinerating chlorinated industrial chemicals and other hydrocarbons. This compound is considered an environmental toxin, and may pose reproductive, as well as, other health risks for animals and humans. (NLM, Medical Subject Headings)
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