toxin

noun

tox·​in ˈtäk-sən How to pronounce toxin (audio)
: a poisonous substance that is a specific product of the metabolic activities of a living organism and is usually very unstable, notably toxic when introduced into the tissues, and typically capable of inducing antibody formation

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Toxins Are Often Found in Nature

Long before chemists started creating poisons from scratch, humans were employing natural toxins for killing weeds and insects. For centuries South American tribes have used the toxin curare, extracted from a native vine, to tip their arrows. The garden flower called wolfsbane or monkshood is the source of aconite, an extremely potent toxin. The common flower known as jimsonweed contains the deadly poison scopolamine. And the castor-oil plant yields the almost unbelievably poisonous toxin called ricin. Today we hear health advisers of all kinds talk about ridding the body of toxins; but they're usually pretty vague about which ones they mean, and most of these "toxins" wouldn't be called that by biologists.

Examples of toxin in a Sentence

the toxin in scorpion venom read a pamphlet on the toxin responsible for botulism, a food poisoning that can cause paralysis and even death in some cases
Recent Examples on the Web For example, Rachel can’t eat what Celeste makes, supposedly because of the toxins, but after the sisters travel to a camp in the woods where her mother’s siblings live, and their Aunt Jean Gautreau cooks up a feast full of saturated fat, Rachel digs in with abandon. Bethanne Patrick, Los Angeles Times, 30 Nov. 2023 Aerial photographs taken in the aftermath of the storm show the luminescent sheen of oil slicks and other toxins spreading across the city. Jacob Carter, STAT, 10 Nov. 2023 The buildup of toxins in his body had left him comatose. Joseph Goldstein, New York Times, 22 Nov. 2023 Toxicology analyses didn’t find any evidence of poisoning and the stomach contents didn’t show signs of toxins. Will Sullivan, Smithsonian Magazine, 13 Nov. 2023 The plane can identify dangerous toxins, information that could have helped officials determine both possible health impacts to Houstonians from the disaster and the cleanup strategies to be used in recovering from the storm. Jacob Carter, STAT, 10 Nov. 2023 While consuming or touching a poisonous creature can cause harm, you must be bitten or stung by a venomous one for its toxins to take effect. Jake Parks, Discover Magazine, 7 Nov. 2023 The serum uses potent antioxidants to fortify the skin against these toxins and other aggressors (including but not limited to the moisturizing duo of glycerin and squalane, plus vitamins B, C, and E). Adam Hurly, Robb Report, 12 Oct. 2023 Venomous creatures, on the other hand, actively deliver their toxins, usually through a bite or sting. Jake Parks, Discover Magazine, 7 Nov. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'toxin.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

International Scientific Vocabulary

First Known Use

1886, in the meaning defined above

Time Traveler
The first known use of toxin was in 1886

Dictionary Entries Near toxin

Cite this Entry

“Toxin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/toxin. Accessed 10 Dec. 2023.

Kids Definition

toxin

noun
tox·​in ˈtäk-sən How to pronounce toxin (audio)
: a substance produced by a living organism (as a bacterium) that is very poisonous to other organisms and that usually causes antibody formation compare antitoxin
Etymology

derived from Latin tox- "poisonous" and English -in "chemical compound"; tox- from toxicum "poison," from Greek toxikon "arrow poison," from toxon "bow, arrow" — related to intoxicate, toxic see Word History at intoxicate

Medical Definition

toxin

noun
tox·​in ˈtäk-sən How to pronounce toxin (audio)
: a colloidal proteinaceous poisonous substance that is a specific product of the metabolic activities of a living organism and is usually very unstable, notably toxic when introduced into the tissues, and typically capable of inducing antibody formation

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