Weaponised

To make into a weapon.

"Anything can be weaponized. A big enough rock, dropped from a sufficient height, is a very good weapon."

To make more effective as a weapon.

"To weaponize anthrax it is made more distributable, not more virulent."

Made into, or to serve as, a weapon.

"Weaponized anthrax is a biological terror weapon, whereas anthrax found in the wild is unlikely to cause a plague."