Leechcraft

The course of his adventures at length conducted him to Scotland, where he followed his leechcraft with similar success.

The earliest was Apollo, and his son Aesculapius, and Asclepios; and Asclepios was uncle of Hippocrates ; these four earliest invented the building up of leechcrafts about fifteen hundred years after Noah's flood in the days of Artaxerxes, who was king of the Persians; [...]

Our villain, who may or may not be 'Dr James', knows his Latin but not - if I may so phrase it - his leechcraft."

The use of vapour baths ('stone baths') and the smoke of certain herbs to drive out spirits of disease in animals and humans is well-attested in Germanic folklore and leechcraft, though, and might be compared with the use of steam and steam-baths typical of classical medicine, the Christian ritual of burning away the ashes of embers of sin [...]

According to Geoffrey and Layamon it is through his “leechcraft” that he is able to make Uther look like Gorlois.

Herb Lore & Leechcraft

Smitten with apprehension, I crawled unto the cell of one of the brethren, renowned for his leechcraft; [...]

She had long ago accepted his disapproval, but she had perfect trust in him and his leechcraft as she had had at Hugh's bedside in Bordeaux.