Definition of Chemical agent:
A chemical substance producing a specific effect, especially when intentionally used for this reason; (now often) specifically a substance used to incapacitate, injure, or kill people, or cause damage to crops, etc.; a chemical weapon.
Solid, liquid, or gaseous substance that produces an effect on a living organism by acting on the body tissue, or in an environment by interacting with air, water, and/or soil.
Meaning of Chemical agent & Chemical agent Definition