sail·board (s?l?bôrd?)n. A modified surfboard having a single sail mounted on a mast that pivots on a ball joint, ridden while standing up.intr.v. sail·board·ed, sail·board·ing, sail·boards To ride on a sailboard; windsurf.sail?board?er n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.sailboarder (?se?l?b??d?) n (Swimming, Water Sports & Surfing) another name for windsurferCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014