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often attributive
1
: a nonmetallic halogen element that is an essential nutrient in the human diet and is used especially in medicine, photography, and analytical chemistry see Chemical Elements Table
Did you know?
Iodine is a nonmetallic chemical element and the heaviest nonradioactive halogen. It is a very nearly black crystalline solid that can turn to a deep violet, irritating vapor. In nature it is never found uncombined, and occurs mostly in brines and seaweeds. Dietary iodine is essential for thyroid gland function, so table salt usually has potassium iodide added to prevent iodine deficiency. Elemental iodine is used in medicine, in synthesizing some organic chemicals, in manufacturing dyes, in analytical chemistry, and in photography. The radioactive isotope I-131, with an eight-day half-life, is very useful in medicine and other applications.
Example Sentences
Recent Examples on the Web Now my aunt, who 36 years ago was summoned to march under Chornobyl's radioactive cloud, is one of the residents queuing for government distributed iodine in Zaporizhzhia. 
Sasha Dovzhyk, CNN, 2 Sep. 2022 The pills can help block radioactive iodine from being absorbed by the thyroid, decreasing the risk of developing thyroid cancer later from exposure to radioactive material. John Hudson, Washington Post, 27 Aug. 2022 Thawing Arctic permafrost will expose local populations to more radon, and the iodine of desert dust may decrease ozone pollution but increase greenhouse gas longevity. Rafil Kroll-zaidi, Harper’s Magazine , 25 May 2022 The tablets help counteract the effects of radioactive exposure by blocking the body’s absorption of the radioactive form of iodine. Adela Suliman, Washington Post, 28 Aug. 2022 These essential minerals include iron, calcium and iodine. Casey Barber, CNN, 21 July 2022 In the early weeks of the war, demand rose for potassium iodide, which is approved by the Food and Drug Administration for use after exposure to radioactive iodine. Bryan Pietsch, Washington Post, 13 July 2022 GE Healthcare is one of four companies that supply iodine-containing contrast to the US, but the other manufacturers haven't been able to scale up and offset the shortage, according to the Radiological Society of North America. Michael Nedelman, Amanda Sealy And Nadia Kounang, CNN, 7 June 2022 When Russia invaded Ukraine, iodine was at the top of the apocalyptic shopping list. Eleanor Cummins, The New Republic, 26 May 2022 See More
Sasha Dovzhyk, CNN, 2 Sep. 2022 The pills can help block radioactive iodine from being absorbed by the thyroid, decreasing the risk of developing thyroid cancer later from exposure to radioactive material. John Hudson, Washington Post, 27 Aug. 2022 Thawing Arctic permafrost will expose local populations to more radon, and the iodine of desert dust may decrease ozone pollution but increase greenhouse gas longevity. Rafil Kroll-zaidi, Harper’s Magazine , 25 May 2022 The tablets help counteract the effects of radioactive exposure by blocking the body’s absorption of the radioactive form of iodine. Adela Suliman, Washington Post, 28 Aug. 2022 These essential minerals include iron, calcium and iodine. Casey Barber, CNN, 21 July 2022 In the early weeks of the war, demand rose for potassium iodide, which is approved by the Food and Drug Administration for use after exposure to radioactive iodine. Bryan Pietsch, Washington Post, 13 July 2022 GE Healthcare is one of four companies that supply iodine-containing contrast to the US, but the other manufacturers haven't been able to scale up and offset the shortage, according to the Radiological Society of North America. Michael Nedelman, Amanda Sealy And Nadia Kounang, CNN, 7 June 2022 When Russia invaded Ukraine, iodine was at the top of the apocalyptic shopping list. Eleanor Cummins, The New Republic, 26 May 2022 See More Word History
Etymology
French iode "iodine" (borrowed from Greek ioeidḗs "violet-colored," from íon "the color violet"—going back to *wion, akin to the source of Latin viola "the violet flower"— + -o-eidēs -oid entry 2) + -ine entry 2 (after chlorine, fluorine) — more at violet
Note: The French word iode was apparently introduced by the chemists Bernard Courtois (1777-1838) and Joseph Louis Gay-Lussac (1778-1850); cf. B. Courtois, "Découverte d'une substance nouvelle dans le Vareck," Annales de chimie, tome 88 (1813), p. 305: "La substance nouvelle, que depuis on a nommé iode à cause de la belle couleur violette de sa vapeur, a bien tout l'aspect d'un métal." ("The new substance, which since has been named iode because of the beautiful violet color of its vapor, has all the appearance of a metal.") Note that a borrowing from Greek ioeidḗs should properly have yielded ioïde in French rather than iode; the direct source of the latter may have been iṓdēs "rust-colored," a derivative of íos "rust, verdigris," taken erroneously to be a derivative of íon "the color violet."
First Known Use
1814, in the meaning defined at sense 1
Time Traveler
The first known use of iodine was in 1814 Phrases Containing iodine
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