from The Century Dictionary.
- noun A form of versification formerly used in the south of Europe, consisting of a union of verses of four, six, and eight syllables, of which generally the first rimed with the fourth and the second with the third.
Sorry, no etymologies found.
The _redondilla menor_ has the same form expressed in lines of less than eight syllables.
The Spanish ballad, or _romance_, was a stanza (_redondilla_, roundel) of four eight-syllable lines with a prevailing trachaic movement -- just the metre, in short, of "Locksley Hall."
 The _redondilla_ may be considered as the basis of Spanish versification.
The redondilla admits of great variety; but in the romances it is most frequently found to consist of eight syllables, the last foot, and some or all of the preceding, as the case may be, being trochees.
Conde has given a translation of certain Spanish-Arabian poems, in the measure of the original, from which it is evident, that the hemistich of an Arabian verse corresponds perfectly with the redondilla.
_redondilla_ , as the Spanish ballad measure is called, rolling on its graceful, negligent _asonante_,  whose continued repetition seems by its monotonous melody to prolong the note of feeling originally struck, is admirably suited by its flexibility to the most varied and opposite expression; a circumstance which has recommended it as the ordinary measure of dramatic dialogue.