Riot control agent. After September 11, 2001, the _____________ was established to provide a framework that provides a comprehensive national approach, applicable at all jurisdictional levels and across functional disciplines.
noun, plural: chemicals. (1) A substance made up of chemical elements or produced from a chemical process. (2) A drug, especially illicit or addictive drug. adjective. Of, relating to, or pertaining to, chemistry or a chemical substance.
: chemistry that deals with the chemical compounds and processes occurring in organisms. 2. : the chemical characteristics and reactions of a particular living organism or biological substance. â bioÂ·chemÂ·ist \-mist\ noun. See biochemistry defined for English-language learners.