"addict" in the noun sense

1. addict, nut, freak, junkie, junky

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"

2. addict

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

"addict" in the verb sense

1. addict, hook

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

Source: WordNet® (An amazing lexical database of English)

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