The Collaborative International Dictionary of English v.0.48:

Villanella \Vil`la*nel"la\, n.; pl. Villanelle. [It., a pretty
   country girl.] (Mus.)
   An old rustic dance, accompanied with singing.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Villanelle \Vil`la*nelle"\, n. [F.]
   A poem written in tercets with but two rhymes, the first and
   third verse of the first stanza alternating as the third
   verse in each successive stanza and forming a couplet at the
   close. --E. W. Gosse.
   [1913 Webster]