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A saillike device made of lightweight reflective material, attached to a spacecraft to harness the radiation pressure of the sun's light and solar wind for propulsion. Also called light sail.
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.
(Aeronautics) a device that reflects light particles from the sun, gaining momentum in the opposite direction to propel spacecraft forwards
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014