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biological warfare the use of living organisms such as bacteria or viruses to kill or disable people or destroy their food supply.
chemical warfare the use of chemicals such as poisonous gases, fire bombs, and irritants in warfare.
germ warfare the deliberate contamination of an enemy's territory with disease germs.
psychological warfare the use of propaganda, innuendo, or the like to affect, esp. by confusing or undermining, the thinking, feelings, or morale of an opponent.