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1. The process of writing in the sky by releasing a visible vapor from an airplane.
2. The letters or words so formed.
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.
vb (intr) , -writes, -writing, -wrote or -written
(Aeronautics) to write a message in the sky with smoke trails from an aircraft
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014