Definition of Day-Glo™ adjective from the Oxford Advanced Learner's Dictionary

 

Day-Glo™

 adjective
adjective
BrE BrE//ˈdeɪ ɡləʊ//
 
; NAmE NAmE//ˈdeɪ ɡloʊ//
 
 
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having a very bright orange, yellow, green or pink colour Day-Glo cycling shorts Word Origin 1950s: blend of day and glow.
See the Oxford Advanced American Dictionary entry: Day-Glo™