/kee lay"sheuhn/ , n.
1. Chem. the process of chelating.
2. Med.
a. a method of removing certain heavy metals from the bloodstream, used esp. in treating lead or mercury poisoning.
b. a controversial treatment for arteriosclerosis that attempts to remove calcium deposits from the inner walls of the coronary arteries.
[ 1930-35; CHELATE + -ION ]