Note or notes added to the original melodic line for embellishment and added interest.
http://www.translationtown.com/tt/_es/cont/glosarios/culture...

In music ornaments are musical flourishes that are not necessary to the overall melodic (or harmonic) line, but serve to decorate or "ornament" that line. The amount of ornamentation in a piece of music can vary from quite extensive (it was often so in the Baroque
period) to relatively little or even none.

In the baroque period, it was common for performers to improvise ornamentation on a given melodic line. A singer performing a da capo aria, for instance, would sing the melody relatively unornamented the first time, but decorate it with additional flourishes the second time.

Ornamentation may also be indicated by the composer. A number of standard ornaments (described below) are indicated with standard symbols in music notation, while other ornamentations may be appended to the staff in small notes, or simply written normally.

http://encyclopedia.thefreedictionary.com/Musical ornament

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Note added at 19 hrs 25 mins (2004-06-09 16:38:53 GMT)
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Frédéric Francois Chopin (Fryderyk Franciszek Chopin) (1810-1849 ...
... es básicamente una melodía con fascinantes ornamentaciones que se interpreta
con la mano derecha sirviendo de acompañamiento la mano izquierda. ...
www.musicapasion.com/MusicaPasion/ PaginasWeb/biografias/Chopin.htm