The Collaborative International Dictionary of English v.0.48:

Comfrey \Com"frey\, n. [Prob. from F. conferve, L. conferva, fr.
   confervere to boil together, in medical language, to heal,
   grow together. So called on account of its healing power, for
   which reason it was also called consolida.] (Bot.)
   A rough, hairy, perennial plant of several species, of the
   genus Symphytum.
   [1913 Webster]

   Note: A decoction of the mucilaginous root of the "common
         comfrey" (Symphytum officinale) is used in cough
         mixtures, etc.; and the gigantic "prickly comfrey"
         (Symphytum asperrimum) is somewhat cultivated as a
         forage plant.
         [1913 Webster]

WordNet (r) 3.0 (2006):

comfrey
    n 1: perennial herbs of Europe and Iran; make rapidly growing
         groundcover for shaded areas [syn: comfrey, cumfrey]
    2: leaves make a popular tisane; young leaves used in salads or
       cooked [syn: comfrey, healing herb]

U.S. Gazetteer Places (2000):

Comfrey, MN -- U.S. city in Minnesota
   Population (2000):    367
   Housing Units (2000): 171
   Land area (2000):     0.420939 sq. miles (1.090226 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.420939 sq. miles (1.090226 sq. km)
   FIPS code:            12772
   Located within:       Minnesota (MN), FIPS 27
   Location:             44.109328 N, 94.904116 W
   ZIP Codes (1990):     56019
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Comfrey, MN
    Comfrey