magistery

[maj-uh-ster-ee, -stuh-ree] /ˈmædʒ əˌstɛr i, -stə ri/
noun, plural magisteries.
1.
an agency or substance, as in alchemy, to which faculties of healing, transformation, etc., are ascribed.
2.
Obsolete, mastership.
Origin
1490-1500; < Latin magisterium, equivalent to magister master + -ium -ium
British Dictionary definitions for magistery

magistery

/ˈmædʒɪstərɪ; -trɪ/
noun (alchemy) (pl) -teries
1.
an agency or substance, such as the philosopher's stone, believed to transmute other substances
2.
any substance capable of healing
Word Origin
C16: from Medieval Latin magisterium, from Latin: mastery, from magister master