Aaron's rod

plural Aaron's rods

1. Any of various plants with a tall flowering stem, especially:
   1. countableuncountableVerbascum thapsus, the great mullein, common mullein, or hag-taper.First known use First attested in the mid 18th century.

      Synonyms: torchwort, hag-taper, common mullein, great mullein, Adam's flannel, Jacob's staff, Jupiter's staff, cow's lungwort

   2. countableuncountableGoldenrod, the Solidago genus of North American plants with yellow flowers.
   3. countableuncountableHylotelephium telephium (syn. Sedum telephium; orpine, livelong, or live-forever).
2. countableuncountablearchitectureA rod-shaped molding decorated with an entwined snake, and sometimes leaves, vines, or scrolls.
3. archaiccountableuncountableA rod with one serpent twined around it, as used by Aaron (differing from the caduceus of Mercury, which has two serpents).
4. countabledatedslanguncommonuncountableThe penis.