Webster's English Dictionary

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tobacco

to.bac.co \t*-'bak-(.)o-, -'bak-*(-w)\ n or tobaccos [Sp tabaco, prob. fr. 
   Taino, roll of tobacco leaves smoked by the Indians] pl  of the Antilles at 
   the time of Columbus 1: any of a genus (Nicotiana) of chiefly American 
   plants of the night shade family with viscid foliage and tubular flowers; 
   esp : a tall erect annual So. American herb (N. tabacum) cultivated for its 
   leaves 2: the leaves of cultivated tobacco prepared for use in smoking or 
   chewing  or as snuff 3: manufactured products of tobacco (as cigars or 
   cigarettes); also :: smoking as a practice