Source : Webster's Revised Unabridged Dictionary (1913)

Solanaceous \Sol`a*na"ceous\, a. (Bot.)
   Of or pertaining to plants of the natural order
   {Solanace[ae]}, of which the nightshade ({Solanum}) is the
   type. The order includes also the tobacco, ground cherry,
   tomato, eggplant, red pepper, and many more.

Source : WordNet®

solanaceous
     adj : of or relating to plants of the family Solanaceae (the
           potato family)