addict
1. [ noun ] someone who is so ardently devoted to something that it resembles an addiction
Synonyms: junkie junky nut freak
Examples:

"a golf addict" "a car nut" "a control freak"

Related terms: enthusiast gym_rat
2. [ verb ] to cause (someone or oneself) to become dependent (on something, esp. a narcotic drug)
Synonyms: hook
Related terms: habituate addiction use
3. [ noun ] someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms
Related terms: drug_user drug_addict speed_freak caffeine_addict
Similar spelling:   addicted
  addictive
  addiction
  Adsit
  adduct
  adductor
  adactyly
  adductive
  adduction
  adducting
  adactylia
  adust