: a weapon (such as mustard gas or sarin) used in chemical warfare
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While the prevalence of carfentanil still pales in comparison to fentanyl, experts are nevertheless alarmed by the increase of a substance researched for years as a chemical weapon and deployed by Russian forces on Chechen separatists in 2002.—ABC News, 17 Apr. 2026 In 1915, chlorine gas became the first lethal chemical weapon used on the battlefield in World War I, and the German dye industry was the main supplier.—Literary Hub, 2 Apr. 2026 That brand of chemical weapon is sold by Safariland’s Defense Technology.—Thomas Brewster, Forbes.com, 27 Jan. 2026 There are also concerns that troops could encounter fentanyl as a chemical weapon.—Stephanie Pappas, Scientific American, 30 Dec. 2025 See All Example Sentences for chemical weapon