From Longman Dictionary of Contemporary Englishtoxintox‧in /ˈtɒksɪn $ ˈtɑːk-/ noun [countable] HBMa poisonous substance, especially one that is produced by bacteria and causes a particular disease → toxic
Examples from the Corpus
toxin• The first changes of net water and ion transport were observed after the second or third hour after administration of cholera toxin.• Daffodils, hyacinths, bluebells and many species of lily also contain toxins.• This allows less dangerous toxins like lactic acid to accumulate, creating overly acidic conditions in your muscles.• The authority had coincidentally tested the water for toxins on about the same day as the officer cadets had used it.• Adding the copper, which is another metal toxin, only hastened the death of the fish.• He studies phytoplankton toxins that are eaten by shellfish, which then become potent vectors of these toxins paralytic to humans.• Some species of pests then evolve ways of breaking down the toxins, and so on.• And we note this with sadness, because in functioning organizations these toxins need never become potent enough to taint performance.Origin toxin (1800-1900) toxic + -in “chemical compound” 