Definition of ultraviolet adjective from the Oxford Advanced American Dictionary

 

ultraviolet

 adjective
adjective
NAmE//ˌʌltrəˈvaɪələt//
 
(abbreviation UV)[usually before noun](physics)
 
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of or using electromagnetic waves that are just shorter than those of violet light in the spectrum and that cannot be seen ultraviolet rays (= that cause the skin to go darker) an ultraviolet lamp compare infrared
See the Oxford Advanced Learner's Dictionary entry: ultraviolet