biological warfare

biological warfare (uncountable)

1. The use of any harmful organism (such as a bacterium or virus) as a weapon of war.
   • 1951, John Wyndham, The Day of the Triffids, Harmondsworth: Penguin Books, published 1954, page 29:

     At least the United States Government took the suggestion seriously enough to deny emphatically that it controlled any satellites designed to conduct biological warfare directly upon human beings. One or two minor nations, whom no one suspected of controlling any satellites at all, hastened to make similar declarations.

• germ warfare
• chemical warfare
• nuclear warfare