square knot definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a double knot in which the free ends run parallel to the standing parts
square knot definition by American Heritage Dictionary
A common double knot in which the loose ends are parallel to the standing parts, most often used to join the ends of two cords or lines.