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poison gas

poison gas any of various gases sometimes used in warfare or riot control because of their poisonous or corrosive nature. These gases may be roughly grouped according to the portal of entry into the body and their physiological effects. Vesicants (blister gases) produce blisters on all body surfaces (see lewisite ; mustard gas ); lacrimators ( tear gas ) produce severe eye irritation; sternutators (vomiting gases) cause nausea; nerve gases inhibit proper nerve function; and lung irritants attack the respiratory tract, causing pulmonary edema. By the middle of the 19th cent. the possibility of the use of poison gas as a weapon was already envisaged and was viewed by most people with a ...

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