: a weapon (such as mustard gas or sarin) used in chemical warfare
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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 President Donald Trump signed a historic executive order declaring illicit fentanyl and its precursor chemicals Weapons of Mass Destruction (WMD), warning that the drug poses a threat more comparable to a chemical weapon than a narcotic.—Stepheny Price, FOXNews.com, 15 Dec. 2025 The statement echoes a claim repeated by Trump administration officials that street drugs might at some point be used as a chemical weapon, or a weapon of mass destruction, potentially killing large numbers of U.S. citizens.—Brian Mann, NPR, 11 Dec. 2025 See All Example Sentences for chemical weapon