A rod with one serpent twined around it, thus differing from the caduceus of Mercury, which has two.
A plant with a tall flowering stem; esp. the great mullein, or hag-taper, and the golden-rod.
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Webster, Noah. Entry for 'Aaron's Rod'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/aarons-rod.html. 1828.