Webster's English Dictionary

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addict

1. ad.dict \*-'dikt\ vt [L addictus, pp. of addicere to favor, fr. ad- + 
   dicere] to say - more at DICTION 1: to devote or surrender (oneself) to 
   something habitually or obsessively; esp : to accustom (oneself) to the 
   habitual use of a drug 2: to induce to use an addictive drug 
2. ad.dict \'ad-(.)ikt\ n : one who is addicted esp. to a drug