Definition of biological warfare in English:

biological warfare

Syllabification: bi·o·log·i·cal war·fare

Entry from US English dictionary

noun

The use of toxins of biological origin or microorganisms as weapons of war: opposed to chemical and biological warfare

Definition of biological warfare in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…