Chrome 2001
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Merriam Webster Medical Dictionary
Merriam-Webster's Medical Dictionary

Main Entry: ad·dic·tion
Pronunciation: &-'dik-sh&n
Function: noun
: compulsive physiological need for and use of a habit-forming substance (as heroin, nicotine, or alcohol) characterized by tolerance and by well-defined physiological symptoms upon withdrawal ; broadly : persistent compulsive use of a substance known by the user to be physically, psychologically, or socially harmful -- compare HABITUATION, SUBSTANCE ABUSE

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