(Fort.) A small round tower erected at the foot of a bastion. (Obs.)
2.
(a)
Same as Rondeau.
(b)
Specifically, a particular form of rondeau containing fourteen lines in two rhymes, the refrain being a repetition of the first and second lines as the seventh and eighth, and again as the thirteenth and fourteenth.
... hours of their captivity with rhyming. Indeed, there can be no better pastime for a lonely man than the mechanical exercise of verse. Such intricate forms as Charles had been used to from childhood, the ballade with its scanty rhymes; the rondel, with the recurrence first of the whole, then of half the burthen, in thirteen verses, seem to have been invented for the prison and the sick bed. The common Scotch saying, on the sight of anything operose and finical, "he must have had little to do that ... — Familiar Studies of Men & Books • Robert Louis Stevenson