ottava ri·ma /-ˈrimə/
Ot·ta·va ri·ma Pros. A stanza of eight lines of heroic verse, with three rhymes, the first six lines rhyming alternately and the last two forming a couplet. It was used by Byron in “Don Juan,” by Keats in “Isabella,” by Shelley in “The Witch of Atlas,” etc.
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ottava rima
n : a stanza of eight lines of heroic verse with the rhyme
scheme abababcc