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The Collaborative International Dictionary
Ottava rima

Ottava rima \Ot*ta"va ri"ma\ [It. See Octave, and Rhyme.] (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.

Douglas Harper's Etymology Dictionary
ottava rima

1820, Italian, "eight-lined stanza," literally "eighth rhyme," from ottava "eighth" (see octave). A stanza of eight 11-syllable lines, rhymed a b a b a b c c, but in the Byronic variety, they are English heroic lines of 10 syllables.

WordNet
ottava rima

n. a stanza of eight lines of heroic verse with the rhyme scheme abababcc

Wikipedia
Ottava rima
For etymology and similar terms see Octave.

Ottava rima is a rhyming stanza form of Italian origin. Originally used for long poems on heroic themes, it later came to be popular in the writing of mock-heroic works. Its earliest known use is in the writings of Giovanni Boccaccio.

The ottava rima stanza in English consists of eight iambic lines, usually iambic pentameters. Each stanza consists of three alternate rhymes and one double rhyme, following the a-b-a-b-a-b-c-c pattern. The form is similar to the older Sicilian octave, but evolved separately and is unrelated. The Sicilian octave is derived from the medieval strambotto and was a crucial step in the development of the sonnet, whereas the ottava rima is related to the canzone, a stanza form.