addict addict /ˈædɪkt/

noun

1. Someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms  ( addict )
   someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms
   
2. Someone who is so ardently devoted to something that it resembles an addiction  ( addict , freak , junkie [Informal] , junky [Informal] , nut [Informal] )
   someone who is so ardently devoted to something that it resembles an addiction
    A golf addict
   a golf addict
    A car nut
   a car nut
    A bodybuilding freak
   a bodybuilding freak
    A news junkie
   a news junkie
   
   

verb

1. To cause (someone or oneself) to become dependent (on something, especially a narcotic drug)  ( addict , hook )
   to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)