The Collaborative International Dictionary of English v.0.48:

Embellish \Em*bel"lish\, v. t. [imp. & p. p. Embellished; p.
   pr. & vb. n. Embellishing.] [OE. embelisen, embelisshen, F.
   embellir; pref. em- (L. in) + bel, beau, beautiful. See
   Beauty.]
   To make beautiful or elegant by ornaments; to decorate; to
   adorn; as, to embellish a book with pictures, a garden with
   shrubs and flowers, a narrative with striking anecdotes, or
   style with metaphors.

   Syn: To adorn; beautify; deck; bedeck; decorate; garnish;
        enrich; ornament; illustrate. See Adorn.
        [1913 Webster]

WordNet (r) 3.0 (2006):

embellish
    v 1: add details to [syn: embroider, pad, lard,
         embellish, aggrandize, aggrandise, blow up,
         dramatize, dramatise]
    2: be beautiful to look at; "Flowers adorned the tables
       everywhere" [syn: deck, adorn, decorate, grace,
       embellish, beautify]
    3: make more attractive by adding ornament, colour, etc.;
       "Decorate the room for the party"; "beautify yourself for the
       special day" [syn: decorate, adorn, grace, ornament,
       embellish, beautify]
    4: make more beautiful [syn: fancify, beautify, embellish,
       prettify] [ant: uglify]