germ warfare

noun

: the use of harmful microorganisms (such as bacteria) as weapons in war

Examples of germ warfare in a Sentence

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These germ warfare programs raised fears that a rogue country or terrorist cell could start an epidemic that would kill millions of people. Meredith Wolf Schizer, Newsweek, 19 Feb. 2025 World Mosquito Program View 1 Images In a completely different kind of germ warfare, researchers have tested out a way to drop mosquitoes infected with disease-fighting bacteria over populations prone to outbreaks of dengue fever. Michael Franco, New Atlas, 1 Aug. 2024 Imperial Japan killed as many as 30 million civilians in East Asia, while subjecting many thousands to torturous medical experiments and germ warfare. Eric Levitz, Vox, 3 June 2024 There was sufficient evidence from eyewitnesses and accomplices to lend credibility to charges of germ warfare. TIME, 4 May 2024 The country had been on the receiving end of germ warfare, on the part of the Imperial Japanese Army’s biowarfare Unit 731 during World War II. Yanzhong Huang, Foreign Affairs, 5 Mar. 2020

Word History

First Known Use

1938, in the meaning defined above

Time Traveler
The first known use of germ warfare was in 1938

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Cite this Entry

“Germ warfare.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/germ%20warfare. Accessed 4 Jul. 2026.

Medical Definition

germ warfare

noun
germ war·​fare -ˈwȯr-ˌfe(ə)r How to pronounce germ warfare (audio)
: the use of harmful microorganisms (as bacteria) as weapons in war

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