mullein, n. [OE. moleyn, AS. molegn.].
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. [1913 Webster]
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.