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
     n 1: evergreen Australasian tree having white or silvery bark and
          young leaves and yellow flowers [syn: {silver wattle}, {Acacia
          dealbata}]
     2: any of various tropical shrubs or trees of the genus Mimosa
        having usually yellow flowers and compound leaves
     3: a mixed drink containing champagne and orange juice