| Noun | 1. | W.M.D. - a weapon that kills or injures civilian as well as military personnel (nuclear and chemical and biological weapons)chemical weapon - chemical substances that can be delivered using munitions and dispersal devices to cause death or severe harm to people and animals and plants nuclear weapon - a weapon of mass destruction whose explosive power derives from a nuclear reaction weapon, weapon system, arm - any instrument or instrumentality used in fighting or hunting; "he was licensed to carry a weapon" high explosive - a powerful chemical explosive that produces gas at a very high rate | |