rondelet

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A poem similar to a rondeau, usually having seven lines and always two rhymes, with the first line containing four syllables repeated as lines three and seven and the other lines containing eight syllables.

Century Dictionary and Cyclopedia

1. n. A poem of five lines and two refrains. The refrains repeat the first line, generally two words, the rime-scheme being a, b (and refrain); a, b, b (and refrain). It has been written in English, but not much.

Wiktionary

1. n. A metric verse (form), modeled after the rondeau, in two rhymes over seven lines, the first (in four syllables) being repeated as third and refrain (final one), each other line having eight syllables

WordNet 3.0

1. n. a shorter form of rondeau