The Collaborative International Dictionary of English v.0.48:

Nicotiana \Ni*co`ti*a"na\, prop. n. [NL. See Nicotian.] (Bot.)
   A genus of American and Asiatic solanaceous herbs, with
   viscid foliage and funnel-shaped blossoms. Several species
   yield tobacco. See Tobacco.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Nicotiana
    n 1: American and Asiatic aromatic herbs and shrubs with viscid
         foliage [syn: Nicotiana, genus Nicotiana]