com·frey 
(kŭmfrē)
(kŭmfrē)n. pl. com·freys
Any of various hairy perennial Eurasian herbs of the genus Symphytum, especially S. officinale, having variously colored flowers in coiled cymes and long used in herbal medicine.
[Middle English comferi, from Old French cumfirie, from Vulgar Latin *cōnfervia, from Latin cōnferva, from cōnfervēre, to boil together : com-, com- + fervēre, to boil; see FERVENT.]