an elaborate verse form of six six-line stanzas and a tercet: the end words of the first stanza are repeated in varying combinations in the other five stanzas and the tercet
See sestina in American Heritage Dictionary 4
(sĕ-stēˈnə)
noun
A verse form first used by the Provençal troubadours, consisting of six six-line stanzas and a three-line envoy. The end words of the first stanza are repeated in varied order as end words in the other stanzas and also recur in the envoy.