Meaning of dodecasyllable

do•dec•a•syl•la•ble

Pronunciation: (dō-dek"u-sil'u-bul, dō"dek-), [key]
— n.
  1. a word or line of verse containing 12 syllables.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.