the.com/villanelle

means A nineteen-line poem built from five three-line stanzas and a closing four-line stanza, using only two rhymes and repeating two refrain lines throughout.

from From French villanelle, from Italian villanella, a rustic song or dance of the villa — the countryside. It tied originally to peasant part-songs with a repeating refrain, not to a fixed line-and-rhyme scheme; that strict nineteen-line form was crystallized later, in the 19th century, from a single influential model poem, and poets since have treated it as the villanelle's rule.