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Day-Glo

[dey-gloh]
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Trademark.
  1. a brand of pigments and other products that exhibit fluorescence in daylight.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for day-glo

Day-Glo

noun
  1. trademark
    1. a brand of fluorescent colouring materials, as of paint
    2. (as modifier)Day-Glo colours
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for day-glo

Day-Glo

1951, proprietary name (Dane & Co. of London) for a brand of fluorescent paint.

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Online Etymology Dictionary, © 2010 Douglas Harper