someone who is so ardently devoted to something that it resembles an addiction; a golf addict; a car nut; a bodybuilding freak; a news junkie

[ Syn: nut , freak , junkie , junky ]

someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms

to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)

[ Syn: hook ]