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English definition of “ultraviolet”

ultraviolet

adjective [not gradable]    /ˌʌl·trəˈvɑɪ·ə·lɪt/
physics describes light at the purple end of the spectrum (= set of colors into which light is separated ), which cannot be seen by human beings
(Definition of ultraviolet adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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