One of the mysteries of the English language finally explained.
An alcoholic solution of soap (or oleic acid) and camphor with some added essential oils; soap liniment; (also) a preparation made from this, especially by mixing with laudanum; now archaic. In extended use: (United States regional) any medicine; alcohol.
Mid 17th century (in an earlier sense). From post-classical Latin oppodeltoch, probably coined by Paracelsus; perhaps from ancient Greek ὀπός vegetable juice; for the ending, perhaps compare post-classical Latin nostoch.
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