A historical patent medicine or liniment containing chlorine compounds, used in the 19th and early 20th centuries for pain relief.
From chloro- + -odyne (pain relief, from Greek odyne meaning pain). Created as a brand name suggesting pain-relieving properties from chlorine compounds.
Chlorodyne was one of the great questionable medicines of the Victorian era—people swore it cured everything from toothaches to cholera, and nobody was quite sure what was in it or if it actually worked, but everyone wanted a bottle!
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