: a weapon (such as mustard gas or sarin) used in chemical warfare
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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 The executive order casts fentanyl as not just a lethal drug, but as a potential chemical weapon.—Kathryn Watson, CBS News, 15 Dec. 2025 See All Example Sentences for chemical weapon