from The Century Dictionary.
- noun A name given to a substance, formerly supposed to be a glucoside, obtained from
Acorus Calamus. It is of uncertain composition and probably a mixture.
Sorry, no etymologies found.
a volatile oil, and a bitter principle, "acorin;" so that a fluid extract is made by the chemists, of which from thirty to forty drops may be given as a dose, with a  tablespoonful, of water, every half-hour for several consecutive times.