"A living infectious organism used as a weapon or a nonliving toxin derived from a living organism and used as a weapon."

A biological weapon uses a bacteria or virus, or in some cases toxins that come directly from bacteria, to kill people.

(JP 1-02) - An item of materiel, which projects, disperses, or disseminates a biological agent including arthropod vectors.

any weapon usable in biological warfare; "they feared use of the smallpox virus as a bioweapon"

a device used to intentionally cause disease through dissemination of bacteria, virus or microbial toxin

A device that projects, disperses, or disseminates living microorganisms, biological agents, or toxins.