violet ray

noun

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.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/violet%20ray. Accessed 4 Mar. 2021.

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