Synonyms of toxinnext
: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The study continued that natural selection, genetic drift, and recombination biases shape the evolution of nonribosomal peptides, a class of compounds used in antibiotics such as penicillin, as well as toxins. — Maria Mocerino, Interesting Engineering, 24 Oct. 2026 While the giant fungus has not been tested for toxins, some locals had even tasted it and reported no ill effects, said study coauthor Indunil Senanayake, an associate professor at the Kunming Institute of Botany in China. — Mindy Weisberger, CNN Money, 23 Oct. 2026 The physician referred him to a neurologist who noted cognitive impairment, possibly due to exposure to multiple toxins at the Hanford Site. — Lizz Giordano, ProPublica, 22 Oct. 2026 Binding to a toxin does not mean a protein can actually neutralize it, let alone function as a safe and effective treatment. — Robert Hart, The Verge, 22 Oct. 2026 See All Example Sentences for toxin

Word History

Etymology

International Scientific Vocabulary

First Known Use

1887, in the meaning defined above

Time Traveler
The first known use of toxin was in 1887

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Cite this Entry

“Toxin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/toxin. Accessed 27 Oct. 2026.

Kids Definition

: 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

: 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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