Source : Webster's Revised Unabridged Dictionary (1913)

Botanic \Bo*tan"ic\, Botanical \Bo*tan"ic*al\, a. [Cf. F.
   botanique. See {Botany}.]
   Of or pertaining to botany; relating to the study of plants;
   as, a botanical system, arrangement, textbook, expedition. --
   {Botan"ic*al*ly}, adv.

   {Botanic garden}, a garden devoted to the culture of plants
      collected for the purpose of illustrating the science of
      botany.

   {Botanic physician}, a physician whose medicines consist
      chiefly of herbs and roots.

Source : WordNet®

botanical
     adj : of or relating to plants or botany; "botanical garden" [syn:
            {botanic}]