A type of fixed form poetry consisting of thirty-six lines of any length divided into six sestets and a three-line concluding stanza called an envoy. The six words at the end of the first sestet’s lines must also appear at the ends of the other five sestets, in varying order. These six words must also appear in the envoy, where they often resonate important themes. An example of this highly demanding form of poetry is Elizabeth Bishop’s "Sestina." See also sestet.