/ ˈædɪkt; NAmE / noun
1.
a person who is unable to stop taking harmful drugs :
a heroin / drug / nicotine addict
2.
a person who is very interested in sth and spends a lot of their free time on it :
a video game addict
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WORD ORIGIN
early 20th cent.: from the obsolete verb addict , which was a back-formation from addicted .