redondilla, a Spanish stanza form consisting of four trochaic lines, usually of eight syllables each, with a rhyme scheme of abba. Quatrains in this form with a rhyme scheme of abab, sometimes also called redondillas, are more commonly known as serventesios. Redondillas have been common in Castilian poetry since the 16th century. The word is derived from the Spanish redondo, meaning “round.”