:the running over of a sentence from one verse or couplet into another so that closely related words fall in different lines.
http://www.m-w.com/ (Merriam-Webster Online)
:a spillover of poetry from the end of one line to the beginning of the next line.
William Packard, The Art of Poetry Writing (New York: St. Martin’s Press, 1992) , 161.
A Clear Midnight (Walt Whitman)
This is thy hour O Soul, thy free flight into the
Away from books, away from art, the day
Thee fully forth emerging, silent, gazing,
themes thou lovest best,
Night, sleep, death and the stars.