The Collaborative International Dictionary of English v.0.48:

Virelay \Vir"e*lay\, n. [F. virelai; virer to turn + lai a song,
   a lay.]
   An ancient French song, or short poem, wholly in two rhymes,
   and composed in short lines, with a refrain.
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         Of such matter made he many lays,
         Songs, complains, roundels, virelayes.   --Chaucer.
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         To which a lady sung a virelay.          --Dryden.
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   Note: "The virelay admitted only two rhymes, and, after
         employing one for some time, the poet was virer, or to
         turn, to the other." --Nares.
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