Definition of UVB noun from the Oxford Advanced Learner's Dictionary

 

UVB

 noun
noun
BrE BrE//ˌjuː viː ˈbiː//
 
; NAmE NAmE//ˌjuː viː ˈbiː//
 
[uncountable]
 
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ultraviolet rays that are relatively short UVB rays
See the Oxford Advanced American Dictionary entry: UVB