Aaron's rod
    n 1: tall-stalked very woolly mullein with densely packed yellow
         flowers; ancient Greeks and Romans dipped the stalks in
         tallow for funeral torches [syn: common mullein, great
         mullein, Aaron's rod, flannel mullein, woolly
         mullein, torch, Verbascum thapsus]

Aaron's rod \Aar"on's rod`\ ([^a]r"[u^]nz r[o^]d`). [See Exodus
   vii. 9 and Numbers xvii. 8]
   1. (Arch.) A rod with one serpent twined around it, thus
      differing from the caduceus of Mercury, which has two.
      [1913 Webster]

   2. (Bot.) A plant with a tall flowering stem; esp. the great
      mullein, or hag-taper, and the golden-rod.
      [1913 Webster]