1. Someone who is physiologically dependent on a substance or activity
   "The former drug addict shared his story of recovery with the support group"
    
2. Someone who is so ardently devoted to something that it resembles an addiction
   "a golf addict";
   - nut [informal], freak, junkie [informal], junky [informal]

1. To cause (someone or oneself) to become dependent (on something, especially a narcotic drug)
   "He addicted himself to gambling";
   - hook

Derived forms: addicted, addicts, addicting

Type of: accustom, drug user, enthusiast, habituate, partisan, partizan [rare], substance abuser, user

Encyclopedia: Addict