A staff with two oppositely twined serpents and surmounted by two wings; emblem of the U S Army Medical Corps. For veterinary medicine, the double serpent was changed in 1972 to its present form, with a single serpent.
[L. the staff of Mercury; G. kēryx herald, the staff of Hermes]
See Also: staff of Aesculapius
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Examples: glitazone, GI cocktail, etc.