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.

Note: A decoction of the mucilaginous root of the ``common comfrey'' (S. officinale) is used in cough mixtures, etc.; and the gigantic ``prickly comfrey'' (S. asperrimum) is somewhat cultivated as a forage plant.

Source: Webster's Revised Unabridged Dictionary (1913)