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violet ray

noun
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Definition of violet ray

1 : an ultraviolet ray —not used technically
2 : a high-frequency electric discharge from the outer surface of a one-electrode vacuum tube having violet-colored fluorescence and often used in therapeutic treatments

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“Violet ray.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/violet%20ray. Accessed 24 January 2020.

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