Source : Webster's Revised Unabridged Dictionary (1913)

Mimosa \Mi*mo"sa\ (?; 277), n. [NL., fr. Gr. ? imitator. Cf.
   {Mime}.] (Bot.)
   A genus of leguminous plants, containing many species, and
   including the sensitive plants ({Mimosa sensitiva}, and {M.
   pudica}).

   Note: The term mimosa is also applied in commerce to several
         kinds bark imported from Australia, and used in
         tanning; -- called also {wattle bark}. --Tomlinson.

Source : WordNet®

Mimosa sensitiva
     n : semi-climbing prickly evergreen shrub of tropical America
         having compound leaves sensitive to light and touch [syn:
          {sensitive plant}]