Sentence:  Then the physician would use the king of remedies, the powerful one, <WSD>hellebore</WSD>:...We suspect that after a sufficient number of administrations of <WSD>hellebore</WSD> the patient, if he had not done so before, would declare himself cured. 
Meaning of the word marked with <WSD> tags:  Any of the common garden flowering plants of the genus "Helleborus", in family Ranunculaceae, having supposed medicinal properties.