endecasyllabic

And he gave ear to the music, delighting himself in rich imagery, in rare epithets, in the luminous metaphors, the exquisite harmonies, the subtle refinements which distinguished his metrical style and the mysterious artifices of the endecasyllabic verse learned from the admirable poets of the fourteenth century, and more especially from Petrarch.

The Child of Pleasure Gabriele D'Annunzio 1900