D defs.my
Entry 2 senses Webster, 1913

Aaron's rod

/(âr"ŭnz rŏd`)/ · Aar·on's rod · IPA /ˈɛɹ.ənz ɹɑd/
01 A rod with one serpent twined around it, thus differing from the caduceus of Mercury, which has two.
  1. 1.
    A rod with one serpent twined around it, thus differing from the caduceus of Mercury, which has two.(Arch.)
  2. 2.
    A plant with a tall flowering stem; esp. the great mullein, or hag-taper, and the golden-rod.(Bot.)