1) Type of verse 
Dodecasyllable verse (dodecasillabo) is a line of verse with twelve syllables. 12 syllable lines are used in a variety of poetic traditions. Jacob of Serugh (c. 451 – 29 November 521), a Monophysite Bishop of Batnan da-Srugh, also called `Flute of the Spirit` who composed in the dodecasyllabic verse more than seven-hundred verse homilies, or m.....
• (n.) A word consisting of twelve syllables.
Do·dec'a·syl`la·ble noun A word consisting of twelve syllables. 
a word or line of verse containing 12 syllables.