active substances and preparations intended to destroy, deter or control harmful organisms by chemical or biological means. These include disinfectants, chemicals used to preserve products and materials, and non-agricultural pesticides.
Found on http://www.encyclo.co.uk/local/20736
chemical agents with the capacity to kill biological life forms. Bactericides, insecticides, pesticides, etc. are examples. Found on http://www.hach.com/chemGlossary