A species of lyric poetry so composed as to contain a refrain or repetition which recurs according to a fixed law, and a limited number of rhymes recurring also by rule. Note: When the rondeau was called the rondel it was mostly written in fourteen octosyllabic lines of two rhymes, as in the rondels of Charles d'Orleans.... In the 17th century the approved form of the rondeau was a structure of thirteen verses with a refrain.