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A trademark for fluorescent coloring agents and materials. This trademark sometimes occurs in print in lowercase: "The troupe's staging ... follows Alice's fantasy romp through day-glo daisies, past a smiling Cheshire cat" (Los Angeles Times).
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.
a. a brand of fluorescent colouring materials, as of paint
b. (as modifier): Day-Glo colours.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a brand of pigments and other products that fluoresce in daylight.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.