The Collaborative International Dictionary of English v.0.48:

Wreath \Wreath\ (?; 277), n.; pl. Wreaths. [OE. wrethe, AS.
   wr[=ae][eth] a twisted band, fr. wr[imac][eth]an to twist.
   See Writhe.]
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   1. Something twisted, intertwined, or curled; as, a wreath of
      smoke; a wreath of flowers. "A wrethe of gold." --Chaucer.
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            [He] of his tortuous train
            Curled many a wanton wreath.          --Milton.
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   2. A garland; a chaplet, esp. one given to a victor.
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            Conquest doth grant
            He dear wreath to the Grecian combatant. --Chapman.
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            Far back in the ages,
            The plow with wreaths was crowned.    --Bryant.
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   3. (Her.) An appendage to the shield, placed above it, and
      supporting the crest (see Illust. of Crest). It
      generally represents a twist of two cords of silk, one
      tinctured like the principal metal, the other like the
      principal color in the arms.
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The Collaborative International Dictionary of English v.0.48:

Wreathe \Wreathe\, v. t. [imp. Wreathed; p. p. Wreathed;
   Archaic Wreathen; p. pr. & vb. n. Wreathing.] [See
   Wreath, n.] [Written also wreath.]
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   1. To cause to revolve or writhe; to twist about; to turn.
      [Obs.]
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            And from so heavy sight his head did wreathe.
                                                  --Spenser.
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   2. To twist; to convolve; to wind one about another; to
      entwine.
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            The nods and smiles of recognition into which this
            singular physiognomy was wreathed.    --Sir W.
                                                  Scott.
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            From his slack hand the garland wreathed for Eve
            Down dropped.                         --Milton.
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   3. To surround with anything twisted or convolved; to
      encircle; to infold.
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            Each wreathed in the other's arms.    --Shak.
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            Dusk faces with withe silken turbants wreathed.
                                                  --Milton.
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            And with thy winding ivy wreathes her lance.
                                                  --Dryden.
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   4. To twine or twist about; to surround; to encircle.
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            In the flowers that wreathe the sparkling bowl,
            Fell adders hiss.                     --Prior.
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WordNet (r) 3.0 (2006):

wreath
    n 1: flower arrangement consisting of a circular band of foliage
         or flowers for ornamental purposes [syn: wreath,
         garland, coronal, chaplet, lei]