1.  chelation(n = noun.process) - (medicine) the process of removing a heavy metal from the bloodstream by means of a chelate as in treating lead or mercury poisoning;
is a kind of physical process, process
Derived form verb chelate₁

2.  chelation(n = noun.process) - the process of forming a ring by forming one or more hydrogen bonds;
is a kind of chemical action, chemical change, chemical process
Derived form verb chelate₁

1.  the process of removing a heavy metal from a solution by means of a chelate; [WordNet 1.5]

2.  the process of forming a ring by forming one or more hydrogen bonds. [WordNet 1.5]