wishbone boom
Also found in: Wikipedia.
wishbone boom
n
(Sailing) a boom on a sailboard having two arms that are joined at the mast and at the foot of the sail. The windsurfer holds onto it for support and to steer the sailboard
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014