etheylenediaminetetraacetic acid
(EH-thih-leen-DY-uh-meen-TEH-truh-uh-SEE-tik A-sid)
A chemical that binds certain metal ions, such as calcium, magnesium, lead, and iron. It is used in medicine to prevent blood samples from clotting and to remove calcium and lead from the body. It is also used to keep bacteria from forming a biofilm (thin layer stuck to a surface). It is a type of chelating agent. Also called edetic acid and EDTA.