Quick definitions from WordNet (addict)
▸ noun: someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms
▸ noun: someone who is so ardently devoted to something that it resembles an addiction ("A golf addict")
▸ verb: to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)
▸ Also see addict
▸ noun: someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms
▸ noun: someone who is so ardently devoted to something that it resembles an addiction ("A golf addict")
▸ verb: to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)
▸ Also see addict