bob-wheel
bob-wheel
n
a metrical device found in Middle English and Middle Scots poetry, where a very short line (the 'bob') is followed by longer lines with an internal rhyme scheme (the 'wheel')
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014