The story
So called because they often glow with a violet light.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A device used for the application of low-current, high-voltage electricity to the body using an Oudin coil, originally claimed to have medical benefits and more recently used in sadomasochistic sex play. Full definition →
So called because they often glow with a violet light.
Etymology from Wiktionary, CC BY-SA 4.0.