rondeau

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A lyrical poem of French origin having 13 or sometimes 10 lines with two rhymes throughout and with the opening phrase repeated twice as a refrain.
• noun A medieval French song, either monophonic, as in the songs of the trouvères, or polyphonic in construction.

from The Century Dictionary.

• noun A poem in a fixed form, borrowed from the French, and consisting either of thirteen lines on two rimes with an unriming refrain, or of ten lines on two rimes with an unriming refrain.
• noun In music. See rondo.
• noun A game in which nine small balls are placed in front of a stick and propelled diagonally across a billiard-table. At least one ball must fall into the corner pocket and at least one must remain on the table. The players bet on whether the number will be odd or even, the bank taking ten per cent. of all the wagers.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.
• noun (Mus.) See Rondo, 1.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A fixed form of verse based on two rhyme sounds and consisting usually of 13 lines in three stanzas with the opening words of the first line of the first stanza used as an independent refrain after the second and third stanzas.
• noun A monophonic song with a 2-part refrain.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a musical form that is often the last movement of a sonata
• noun a French verse form of 10 or 13 lines running on two rhymes; the opening phrase is repeated as the refrain of the second and third stanzas