Webster's Revised Unabridged Dictionary · 1913

Virelay

Virelay , noun

[French 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.
Of such matter made he many lays, Songs, complains, roundels, virelayes. — Chaucer
To which a lady sung a virelay. — Dryden

“The virelay admitted only two rhymes, and, after employing one for some time, the poet was virer, or to turn, to the other.”