Source : Webster's Revised Unabridged Dictionary (1913)

Mullein \Mul"lein\, n. [OE. moleyn, AS. molegn.] (Bot.)
   Any plant of the genus {Verbascum}. They are tall herbs
   having coarse leaves, and large flowers in dense spikes. The
   common species, with densely woolly leaves, is {Verbascum
   Thapsus}.

   {Moth mullein}. See under {Moth}.

   {Mullein foxglove}, an American herb ({Seymeria macrophylla})
      with coarse leaves and yellow tubular flowers with a
      spreading border.

   {Petty mullein}, the cowslip. --Dr. Prior.

Hag-taper \Hag"-ta`per\, n. [Cf. 1st {Hag}, and {Hig-taper}.]
   (Bot.)
   The great woolly mullein ({Verbascum Thapsus}).

Source : WordNet®

Verbascum thapsus
     n : 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}]