English word bioweapon comes from English weapon, English bio- (Life. Organic life.)

Detailed word origin of bioweapon

Dictionary entry	Language	Definition
weapon	English (eng)	(informal, humorous) A tool of any kind.. An instrument of attack or defense in combat or hunting, e.g. most guns, missiles, or swords.. An instrument or other means of harming or exerting control over another.
bio-	English (eng)	Life. Organic life.
bioweapon	English (eng)	Any weapon designed to be used in biological warfare.

Words with the same origin as bioweapon