'detoxification' definitions:

Definition of 'detoxification'

noun

A treatment for addiction to drugs or alcohol intended to remove the physiological effects of the addictive substances

noun

Treatment for poisoning by neutralizing the toxic properties (normally a function of the liver)

From: GCIDE

detoxification \detoxification\ n.
1. a medically supervised treatment for addiction to drugs or alcohol intended to rid the body of the addictive substances. [WordNet 1.5]
2. treatment for poisoning by counteracting its toxic properties. [WordNet 1.5]
3. conversion (of a poisonous substance) to a non-toxic or harmless state. [PJC]