The story
Brand name. From Vi (of unknown origin) + cod- (in codeine) + -in. One theory is that Vi is from the Roman numeral VI, as the component hydrocodone is approximately 6 times as potent as codeine.
Etymology from Wiktionary, CC BY-SA 4.0.
Vicodin
Today it means: A brand name for an analgesic combination drug containing hydrocodone and paracetamol, often used for recreational purposes. Full definition →