twelve-step
Concise Oxford English Dictionary © 2008 Oxford University Press:
twelve-step
▶adjective denoting or relating to a process of recovery from an addiction by following a twelve-stage programme, especially one devised or similar to that devised by Alcoholics Anonymous. ▶verb (often as noun twelve-stepping) (of an addict) undergo such a programme.
– derivatives
twelve-stepper noun.
twelve-stepper noun.
'twelve-step' also found in these Oxford entries:

