a role borne by a molecular entity and is realized in a process of absorption by an organism alters, or effects (or is assumed to effect) a function(s) which inhere in an organism
This is just here as a test because I lose it
Term information
example of usage
http://www.answers.com/topic/drug 1. A substance used in the diagnosis, treatment, or prevention of a disease or as a component of a medication. 2. Such a substance as recognized or defined by the U.S. Food, Drug, and Cosmetic Act.