The Collaborative International Dictionary of English v.0.48:

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
   Mimosa pudica).
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   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.
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The Collaborative International Dictionary of English v.0.48:

Wattle \Wat"tle\, n. [AS. watel, watul, watol, hurdle, covering,
   wattle; cf. OE. watel a bag. Cf. Wallet.]
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   1. A twig or flexible rod; hence, a hurdle made of such rods.
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            And there he built with wattles from the marsh
            A little lonely church in days of yore. --Tennyson.
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   2. A rod laid on a roof to support the thatch.
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   3. (Zool.)
      (a) A naked fleshy, and usually wrinkled and highly
          colored, process of the skin hanging from the chin or
          throat of a bird or reptile.
      (b) Barbel of a fish.
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   4.
      (a) The astringent bark of several Australian trees of the
          genus Acacia, used in tanning; -- called also
          wattle bark.
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   5. Material consisting of wattled twigs, withes, etc., used
      for walls, fences, and the like. "The pailsade of wattle."
      --Frances Macnab.
      [Webster 1913 Suppl.]

   6. (Bot.) In Australasia, any tree of the genus Acacia; --
      so called from the wattles, or hurdles, which the early
      settlers made of the long, pliable branches or of the
      split stems of the slender species. The bark of such trees
      is also called wattle. See also Savanna wattle, under
      Savanna.
      [Webster 1913 Suppl. +PJC]

   Wattle turkey. (Zool.) Same as Brush turkey.
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