1) Poetic form 
A terzanelle is a poetic form combining aspects of the villanelle and the terza rima. It is nineteen lines total, with five triplets and a concluding quatrain. The middle line of each triplet stanza is repeated as the third line of the following stanza, and the first and third lines of the initial stanza are the second and final lines of the concl...
Hybrid form combining the shape/length of a villanelle with the chain rhyme of terza rima. An example is Lewis Turco's Terzanelle in Thunderweather.