I. adjective 1. relating to biology or living organisms. 2. (of a detergent or other cleaning product) containing enzymes to assist the process of cleaning. 3. relating to or involving the use of microorganisms or toxins of biological origin as weapons of war. 4. (of a member of a person’s family) genetically related; related by blood • his biological mother.
II. noun — (usu. biologicals) 1. a substance of biological origin used as a drug, vaccine, pesticide, etc. • a wide spectrum of biologicals are produced from animal cells in culture.